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•	enhances investors’ understanding of BXP and BPLP by enabling investors to view the business as a whole in the same manner as management views and operates the business;

•	eliminates duplicative disclosure and provides a more concise and readable presentation because a substantial portion of the disclosure applies to both BXP and BPLP; and

•	creates time and cost efficiencies through the preparation of one combined report instead of two separate reports.

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•	Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities;

•	Item 6. Selected Financial Data;

•	Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations includes information specific to each entity, where applicable;

•	Item 7. Liquidity and Capital Resources includes separate reconciliations of amounts to each entity’s financial statements, where applicable;

•	Item 8. Financial Statements and Supplementary Data which includes the following specific disclosures for BXP and BPLP:

•	Item 15. Financial Statement Schedule—Schedule 3.

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•	178 office properties (including nine properties under construction/redevelopment);

•	twelve retail properties;

•	six residential properties (including two under construction); and

•	one hotel.

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to target a few carefully selected geographic markets: Boston, Los Angeles, New York, San Francisco and Washington, DC, and to be one of the leading, if not the leading, developers, owners and managers in each of those markets with a full-service office in each market providing property management, leasing, development, construction and legal expertise. We select markets and submarkets with a diverse economic base and a deep pool of prospective tenants in various industries and where tenants have demonstrated a preference for high-quality office buildings and other facilities. Additionally, our markets have historically been able to recruit new talent to them and as such created job growth that results in growth in rental rates and occupancy over time. We have explored and may continue to explore for future investment select domestic and international markets that exhibit these same traits;

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to emphasize markets and submarkets within those markets where the difficulty of receiving the necessary approvals for development and the necessary financing constitute high barriers to the creation of new supply, and where skill, financial strength and diligence are required to successfully develop, finance and manage high-quality office, research and development space, as well as selected retail and residential space;

•	to take on complex, technically challenging development projects, leveraging the skills of our management team to successfully develop, acquire or reposition properties that other organizations may not have the capacity or resources to pursue;

•	to own and develop high-quality real estate designed to meet the demands of today’s tenants who require sophisticated telecommunications and related infrastructure, support services, sustainable features and amenities, and to manage those facilities so as to become the landlord of choice for both existing and prospective clients;

•	to opportunistically acquire assets that increase our market share in the markets in which we have chosen to concentrate, as well as potential new markets, which exhibit an opportunity to improve returns through repositioning (through a combination of capital improvements and shift in marketing strategy), changes in management focus and leasing;

•

to explore joint venture opportunities with existing property owners located in desirable locations, who seek to benefit from the depth of development and management expertise we are able to provide and our access to capital, and/or to explore joint venture opportunities with strategic institutional partners, leveraging our skills as developers, owners and managers of Class A office space and mixed-use complexes;

•	to pursue on a selective basis the sale of properties or interests therein, including core properties, to either (1) take advantage of the demand for our premier properties and realize the value we have created or (2) pare from our portfolio properties that we believe have slower future growth potential;

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•	to seek third-party development contracts to enable us to retain and utilize our existing development and construction management staff, especially when our internal development is less active or when new development is less-warranted due to market conditions; and

•	to enhance our capital structure through our access to a variety of sources of capital and proactively manage our debt expirations. In the current economic climate with relatively low interest rates we have and will continue to attempt to lower the cost of our debt capital and seek opportunities to lock in such low rates through early debt repayment, refinancings and interest rate hedges.

•	our control of sites (including sites under contract or option to acquire) in our markets that could support in excess of 17.1 million additional square feet of new office, retail and residential development;

•	our reputation gained through 49 years of successful operations and the stability and strength of our existing portfolio of properties;

•	our relationships with leading national corporations, universities and public institutions, including government agencies, seeking new facilities and development services;

•	our relationships with nationally recognized financial institutions that provide capital to the real estate industry;

•	our track record and reputation for executing acquisitions efficiently provide comfort to domestic and foreign institutions, private investors and corporations who seek to sell commercial real estate in our market areas;

•	our ability to act quickly on due diligence and financing;

•	our relationships with institutional buyers and sellers of high-quality real estate assets;

•	our ability to procure entitlements from multiple municipalities to develop sites and attract land owners to sell or partner with us; and

•	our relationship with domestic and foreign investors who seek to partner with companies like ours.

•

Development in selected submarkets. We believe the selected development of well-positioned office buildings, residential buildings and mixed-use complexes may be justified in our markets. We believe in acquiring land after taking into consideration timing factors relating to economic cycles and in response to market conditions that allow for its development at the appropriate time. While we purposely concentrate in markets with high barriers-to-entry, we have demonstrated throughout our 49-year history, an ability to make carefully timed land acquisitions in submarkets where we can become one of the market leaders in establishing rent and other business terms. We believe that there are opportunities at key locations in our existing and other markets for a well-capitalized developer to acquire land with development potential.

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Acquisition of assets and portfolios of assets from institutions or individuals. We believe that due to our size, management strength and reputation, we are well positioned to acquire portfolios of assets or individual properties from institutions or individuals if valuations meet our criteria. In addition, we believe that our market knowledge and our liquidity and access to capital may provide us with a competitive advantage when pursuing acquisitions. Opportunities to acquire properties may also come through the purchase of first mortgage or mezzanine debt. We are also able to appeal to sellers wishing to contribute on a tax-deferred basis their ownership of property for equity in a diversified real estate operating company that offers liquidity through access to the public equity markets in addition to a quarterly distribution. Our ability to offer common and preferred units of limited partnership in BPLP to sellers who would otherwise recognize a taxable gain upon a sale of assets for cash or BXP’s common stock may facilitate this type of transaction on a tax-efficient basis. Recent Treasury Regulations, may limit certain of the tax benefits previously available to sellers in these transactions.

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Acquisition of underperforming assets and portfolios of assets. We believe that because of our in-depth market knowledge and development experience in each of our markets, our national reputation with brokers, financial institutions, owners of real estate and others involved in the real estate market and our access to competitively-priced capital, we are well-positioned to identify and acquire existing, underperforming properties for competitive prices and to add significant additional value to such properties through our effective marketing strategies, repositioning/redevelopment expertise and a responsive property management program.

•	Cultivate existing submarkets and long-term relationships with credit tenants. In choosing locations for our properties, we have paid particular attention to transportation and commuting patterns, physical environment, adjacency to established business centers and amenities, proximity to sources of business growth and other local factors.

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Directly manage our office properties to maximize the potential for tenant retention. We provide property management services ourselves, rather than contracting for this service, to maintain awareness of and responsiveness to tenant needs. We and our properties also benefit from cost efficiencies produced by an experienced work force attentive to preventive maintenance and energy management and from our continuing programs to assure that our property management personnel at all levels remain aware of their important role in tenant relations. In addition, we reinvest in our properties by adding new services and amenities that are desirable to our tenants.

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Replace tenants quickly at best available market terms and lowest possible transaction costs. We believe that we are well-positioned to attract new tenants and achieve relatively high rental and occupancy rates as a result of our well-located, well-designed and well-maintained properties, our reputation for high-quality building services and responsiveness to tenants, and our ability to offer expansion and relocation alternatives within our submarkets.

•	Extend terms of existing leases to existing tenants prior to expiration. We have also successfully structured early tenant renewals, which have reduced the cost associated with lease downtime while securing the tenancy of our highest quality credit-worthy tenants on a long-term basis and enhancing relationships.

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Re-development of existing assets. We believe the select re-development of assets within our portfolio, where through the ability to increase the building size and/or to increase cash flow and generate appropriate returns on incremental investment after consideration of the asset’s current and future cash flows, may be desirable. This generally occurs in situations in which we are able to increase the building’s size, improve building systems and sustainability features, and/or add tenant amenities, thereby increasing tenant demand, generating acceptable returns on incremental investment and enhancing the long-term value of the property and the company. In the past, we have been particularly successful at gaining local government approval for increased density at several of our assets, providing the opportunity to enhance value at a particular location. Our strong regional relationships and recognized re-development expertise have enabled us to capitalize on unique build-to-suit opportunities. We intend to seek and expect to continue to be presented with such opportunities in the near term allowing us to earn attractive returns on these development opportunities through multiple business cycles.

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(1)	Full 2018 calendar year energy and water data is not available fully checked by a third party until March 31, 2019. 2017 is the most recent year for which complete energy and water data is available and checked by a third party.

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(2)

The charts reflect the performance of our occupied and actively managed office building portfolio in Boston, Los Angeles, New York, San Francisco and Washington, DC. Occupied office buildings are buildings with no more than 50% vacancy. Actively managed buildings are buildings where we have operational control of building system performance and investment decisions. At the end of the 2017 calendar year, this included 101 buildings totaling 39.4 million gross square feet.

(3)	Floor area is considered to have complete energy consumption data coverage when energy consumption data (i.e., energy types and amounts consumed) is obtained by us for all types of energy consumed in the relevant floor area during the fiscal year, regardless of when such data was obtained.

(4)	The scope of energy includes energy purchased from sources external to us and our tenants or produced by us or our tenants and energy from all sources, including fuel, gas, electricity and steam.

(5)	Water sources include surface water (including water from wetlands, rivers, lakes and oceans), groundwater, rainwater collected directly and stored by the registrant, wastewater obtained from other entities, municipal water supplies or supply from other water utilities.

(6)	During the 2017 calendar year, 66 buildings representing 61% of our eligible portfolio were ENERGY STAR certified.

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•	The Board of Directors has adopted charters for each of its Audit, Compensation and Nominating and Corporate Governance Committees. A copy of each of these charters is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Committees and Charters.”

•	The Board of Directors has adopted Corporate Governance Guidelines, a copy of which is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Governance Guidelines.”

•

The Board of Directors has adopted a Code of Business Conduct and Ethics, which governs business decisions made and actions taken by BXP’s directors, officers and employees. A copy of this code is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Code of Conduct and Ethics.” BXP intends to disclose on this website any amendment to, or waiver of, any provisions of this Code applicable to the directors and executive officers of BXP that would otherwise be required to be disclosed under the rules of the SEC or the New York Stock Exchange.

•	The Board of Directors has established an ethics reporting system that employees may use to anonymously report possible violations of the Code of Business Conduct and Ethics, including concerns regarding questionable accounting, internal accounting controls or auditing matters, by telephone or over the internet.

•	The Board of Directors has adopted a Policy on our Political Spending, a copy of which is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Policy on Political Spending.”

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•	downturns in the national, regional and local economic conditions (particularly increases in unemployment);

•	competition from other office, hotel, retail and residential buildings;

•	local real estate market conditions, such as oversupply or reduction in demand for office, hotel, retail or residential space;

•	changes in interest rates and availability of financing;

•	vacancies, changes in market rental rates and the need to periodically repair, renovate and re-let space;

•	changes in space utilization by our tenants due to technology, economic conditions and business culture;

•	increased operating costs, including insurance expense, utilities, real estate taxes, state and local taxes and heightened security costs;

•	civil disturbances, earthquakes and other natural disasters or terrorist acts or acts of war which may result in uninsured or underinsured losses or decrease the desirability to our tenants in impacted locations;

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•	significant expenditures associated with each investment, such as debt service payments, real estate taxes, insurance and maintenance costs which are generally not reduced when circumstances cause a reduction in revenues from a property;

•	declines in the financial condition of our tenants and our ability to collect rents from our tenants; and

•	decreases in the underlying value of our real estate.

•	we may be unable to proceed with the development of properties because we cannot obtain financing on favorable terms or at all;

•	we may incur construction costs for a development project that exceed our original estimates due to increases in interest rates and increased materials, labor, leasing or other costs, which could make completion of the project less profitable because market rents may not increase sufficiently to compensate for the increase in construction costs;

•	we may be unable to obtain, or face delays in obtaining, required zoning, land-use, building, occupancy, and other governmental permits and authorizations, which could result in increased costs and could require us to abandon our activities entirely with respect to a project;

•	we may abandon development opportunities after we begin to explore them and as a result we may lose deposits or fail to recover expenses already incurred;

•	we may expend funds on and devote management’s time to projects that we do not complete;

•	we may be unable to complete construction and/or leasing of a property on schedule or at all; and

•	we may suspend development projects after construction has begun due to changes in economic conditions or other factors, and this may result in the write-off of costs, payment of additional costs or increases in overall costs when the development project is restarted.

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•	we may lease developed properties at rental rates that are less than the rates projected at the time we decide to undertake the development;

•	operating expenses and construction costs may be greater than projected at the time of development, resulting in our investment being less profitable than we expected; and

•	occupancy rates and rents at newly developed properties may fluctuate depending on a number of factors, including market and economic conditions, and may result in our investments being less profitable than we expected or not profitable at all.

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•	the third party may be unable to make full and timely payments of interest and principal on the loan when due;

•	if the third-party buyer to whom we provide seller financing and utilizes the assets as collateral does not manage the property well, or the property otherwise fails to meet financial projections, performs poorly or declines in value, then the buyer may not have the funds or ability to raise new debt with which to make required payments of interest and principal to us;

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if we loan funds to a joint venture, and the joint venture is unable to make required payments of interest or principal, or both, or there are disagreements with respect to the repayment of the loan or other matters, then we could have a resulting dispute with our partner(s), and such a dispute could harm our relationship(s) with our partner(s) and cause delays in developing or selling the property or the failure to properly manage the property; and

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if we loan funds to a joint venture and the joint venture is unable to make required payments of interest and principal, or both, then we may exercise remedies available to us in the joint venture agreement that could allow us to increase our ownership interest or our control over major decisions, or both, which could result in an unconsolidated joint venture becoming consolidated with our financial statement; doing so could require us to reallocate the purchase price among the various asset and liability components and this could result in material changes to our reported results of operations and financial condition.

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•	the financial condition of our tenants, many of which are media and technology, financial, government, legal and other professional firms, may be adversely affected, which may result in tenant defaults under leases due to bankruptcy, lack of liquidity, lack of funding, operational failures or for other reasons;

•	significant job losses in the financial and professional services industries may occur, which may decrease demand for our office space, causing market rental rates and property values to be negatively impacted;

•	our ability to borrow on terms and conditions that we find acceptable, or at all, may be limited, which could reduce our ability to pursue acquisition and development opportunities and refinance existing debt, reduce our returns from our acquisition and development activities and increase our future interest expense;

•	reduced values of our properties may limit our ability to dispose of assets at attractive prices or to obtain debt financing secured by our properties and may reduce the availability of unsecured loans;

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the value and liquidity of our short-term investments and cash deposits could be reduced as a result of a deterioration of the financial condition of the institutions that hold our cash deposits or the institutions or assets in which we have made short-term investments, a dislocation of the markets for our short-term investments, increased volatility in market rates for such investments or other factors;

•	one or more lenders under our line of credit could refuse to fund their financing commitment to us or could fail and we may not be able to replace the financing commitment of any such lenders on favorable terms, or at all; and

•	to the extent we enter into derivative financial instruments, one or more counterparties to our derivative financial instruments could default on their obligations to us, or could fail, increasing the risk that we may not realize the benefits of these instruments.

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(1)	Except for the Series B Cumulative Redeemable Preferred Stock, which have been valued at the liquidation preference of $2,500 per share, values based on the closing price per share of BXP’s Common Stock on February 22, 2019 of $135.67.

(2)	Includes 1,197,012 LTIP Units (including 118,067 2012 OPP Units, 68,659 2013 MYLTIP Units, 23,100 2014 MYLTIP Units, 28,724 2015 MYLTIP Units and 105,980 2016 MYLTIP Units), but excludes an aggregate of 951,850 MYLTIP Units granted between 2017 and 2019.

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•	even if we enter into an acquisition agreement for a property, we may be unable to complete that acquisition after making a non-refundable deposit and incurring certain other acquisition-related costs;

•	we may be unable to obtain or assume financing for acquisitions on favorable terms or at all;

•	acquired properties may fail to perform as expected;

•	the actual costs of repositioning, redeveloping or maintaining acquired properties may be greater than our estimates;

•	the acquisition agreement will likely contain conditions to closing, including completion of due diligence investigations to our satisfaction or other conditions that are not within our control, which may not be satisfied;

•	acquired properties may be located in new markets, either within or outside the United States, where we may face risks associated with a lack of market knowledge or understanding of the local economy, lack of business relationships in the area, costs associated with opening a new regional office and unfamiliarity with local governmental and permitting procedures;

•	we may acquire real estate through the acquisition of the ownership entity subjecting us to the risks of that entity; and

•	we may be unable to quickly and efficiently integrate new acquisitions, particularly acquisitions of portfolios of properties, into our existing operations, and this could have an adverse effect on our results of operations and financial condition.

•	liabilities for clean-up of undisclosed environmental contamination;

•	claims by tenants, vendors or other persons against the former owners of the properties;

•	liabilities incurred in the ordinary course of business; and

•	claims for indemnification by general partners, directors, officers and others indemnified by the former owners of the properties.

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•	we may be unable to acquire a desired property because of competition from other well-capitalized real estate investors, including publicly traded and private REITs, institutional investment funds and other real estate investors; and

•	even if we are able to acquire a desired property, competition from other real estate investors may significantly increase the purchase price.

•	we could become engaged in a dispute with any of our joint venture partners that might affect our ability to develop, finance or operate a property and could lead to the sale of either parties' ownership interest or the property;

•	some of our joint ventures are subject to debt and in the current credit markets the refinancing of such debt may require equity capital calls;

•	our joint venture partners may default on their obligations necessitating that we fulfill their obligation ourselves;

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•	our joint venture partners may have different objectives than we have regarding the appropriate timing and terms of any sale or refinancing of properties or the commencement of development activities;

•	our joint venture partners may be structured differently than us for tax purposes and this could create conflicts of interest;

•	our joint venture partners may have competing interests in our markets that could create conflicts of interest;

•	our joint ventures may be unable to repay any amounts that we may loan to them; and

•	our joint venture agreements may contain provisions limiting the liquidity of our interest for sale or sale of the entire asset.

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•	our hotel property competes for guests with other hotels, a number of which may have greater marketing and financial resources than our hotel-operating business partners;

•	if there is an increase in operating costs resulting from inflation and other factors, our hotel-operating business partners may not be able to offset such increase by increasing room rates;

•	our hotel property is subject to the fluctuating and seasonal demands of business travelers and tourism; and

•	our hotel property is subject to general and local economic and social conditions that may affect demand for travel in general, including war and terrorism.

•	direct obligations issued by the U.S. Treasury;

•	obligations issued or guaranteed by the U.S. government or its agencies;

•	taxable municipal securities;

•	obligations (including certificates of deposit) of banks and thrifts;

•	commercial paper and other instruments consisting of short-term U.S. dollar denominated obligations issued by corporations and banks;

•	repurchase agreements collateralized by corporate and asset-backed obligations;

•	both registered and unregistered money market funds; and

•	other highly rated short-term securities.

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•	properly manage and maintain the asbestos;

•	notify and train those who may come into contact with asbestos; and

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•	undertake special precautions, including removal or other abatement, if asbestos would be disturbed during renovation or demolition of a building.

•	the environmental assessments and updates did not identify or properly address all potential environmental liabilities;

•	a prior owner created a material environmental condition that is not known to us or the independent consultants preparing the assessments;

•	new environmental liabilities have developed since the environmental assessments were conducted; and

•	future uses or conditions such as changes in applicable environmental laws and regulations could result in environmental liability for us.

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•	disrupt the proper functioning of our networks and systems and therefore our operations and/or those of certain of our tenants;

•	result in misstated financial reports, violations of loan covenants, missed reporting deadlines and/or missed permitting deadlines;

•	result in our inability to properly monitor our compliance with the rules and regulations regarding BXP’s qualification as a REIT;

•	result in the unauthorized access to, and destruction, loss, theft, misappropriation or release of, proprietary, confidential, sensitive or otherwise valuable information of ours or others, which others could use to compete against us or which could expose us to damage claims by third-parties for disruptive, destructive or otherwise harmful purposes and outcomes;

•	result in our inability to maintain the building systems relied upon by our tenants for the efficient use of their leased space;

•	require significant management attention and resources to remedy any damages that result;

•	subject us to claims for breach of contract, damages, credits, penalties or termination of leases or other agreements; and

•	damage our reputation among our tenants and investors generally.

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•	BXP would not be allowed a deduction for dividends paid to stockholders in computing its taxable income and would be subject to federal income tax at regular corporate rates;

•	BXP also could be subject to the federal alternative minimum tax for tax years ending before January 1, 2018 and possibly increased state and local taxes; and

•	unless BXP is entitled to relief under statutory provisions, BXP could not elect to be subject to tax as a REIT for four taxable years following the year during which it was disqualified.

•	delay or prevent a change of control over BXP or a tender offer, even if such action might be beneficial to BXP’s stockholders; and

•	limit BXP’s stockholders’ opportunity to receive a potential premium for their shares of common stock over then-prevailing market prices.

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•	holders of partnership interests in BPLP, including BXP, must vote on the matter;

•	BXP must vote its partnership interests in the same proportion as its stockholders voted on the transaction; and

•	the result of the vote of holders of partnership interests in BPLP must be such that had such vote been a vote of stockholders, the business combination would have been approved.

•	the extent of investor interest in our securities;

•	the general reputation of REITs and the attractiveness of our equity securities in comparison to other equity securities, including securities issued by other real estate-based companies;

•	our underlying asset value;

•	investor confidence in the stock and bond markets, generally;

•	national economic conditions;

•	changes in tax laws;

•	our financial performance;

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•	changes in our credit ratings; and

•	general stock and bond market conditions, including changes in interest rates.

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(1)	Represents signed leases for in-service properties which revenue recognition has commenced in accordance with generally accepted accounting principles in the United States (“GAAP”).

(2)	Excludes the portion that was removed from the in-service portfolio during the third quarter of 2016 as part of a planned redevelopment.

(3)	Property is an unconsolidated joint venture.

(4)	Property is held for redevelopment.

(5)	On January 24, 2019, we completed the sale of this property (See Note 19 to the Consolidated Financial Statements).

(6)	This project was completed and fully placed in-service on June 7, 2018 and is still in its initial lease-up period. Percentage leased is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(7)	Includes 24,542 square feet of retail space which is 100% leased as of December 31, 2018. Note that these amounts are not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(8)	Note that these amounts are not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(9)	Includes 26,179 square feet of retail space which is 100% leased as of December 31, 2018. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(10)	This project was completed and fully placed in-service on September 1, 2018 and is still in its initial lease-up period. Percentage leased is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(11)	Includes 14,527 square feet of retail space which is 100% leased as of December 31, 2018. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(12)	Includes 9,617 square feet of retail space which is 100% leased as of December 31, 2018. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(13)	Represents the weighted-average room occupancy for the year ended December 31, 2018. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(14)	Includes 4,260 square feet of retail space which is 100% leased as of December 31, 2018. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2018.

(15)	Represents percentage leased as of February 22, 2019, including leases with future commencement dates.

(16)	The low-rise portion of 601 Lexington Avenue.

(17)	This project is subject to a 99-year ground lease (including extension options) with an option to purchase in the future.

(18)	Excludes residential units.

(1)	Represents signed leases, excluding hotel and residential properties, for which revenue recognition has commenced in accordance with GAAP.

(2)

Represents the monthly contractual base rents and recoveries from tenants under existing leases as of December 31, 2018, 2017, 2016, 2015 and 2014 multiplied by twelve. These annualized amounts are before rent abatements and include expense reimbursements, which may be estimates as of such date. The aggregate amounts of rent abatements per square foot under existing leases as of December 31, 2018, 2017, 2016, 2015 and 2014 for the succeeding twelve-month period were $0.97, $1.67, $1.18, $0.60, and $1.05, respectively.

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(1)	Includes 157,029 and 1,980 square feet of space in properties in which we have a 50% and 20% interest, respectively.

(2)	Includes 576,798 and 223,424 square feet of space in properties in which we have a 55% and 20% interest, respectively.

(3)	Includes 637,993 square feet of space in properties in which we have a 55% interest.

(4)	Includes 50,887 and 540,559 square feet of space in properties in which we have a 60% and 55% interest, respectively.

(5)	Includes 580,741 square feet of space in a property in which we have a 95% interest.

(6)	Includes 43,661 square feet of space in a property in which we have a 50% interest.

(7)	Includes 304,619 square feet of space in a property in which we have a 55% interest.

(8)	Includes 76,401 and 161,879 square feet of space in properties in which we have a 95% and 20% interest, respectively.

(9)	Includes 385,248 and 28,147 square feet of space in properties in which we have a 60% and 55% interest, respectively.

(10)	Includes 351,865 square feet of space in a property in which we have a 55% interest.

(11)	Includes 358,077 square feet of space in a property in which we have a 55% interest.

(12)	Includes 251,941 square feet of space in a property in which we have a 25% interest.

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(1)	Includes 100% of unconsolidated joint venture properties. Does not include residential units or the hotel.

(2)	Does not include data for leases expiring in a particular year when leases for the same space have already been signed with replacement tenants with future commencement dates. In those cases, the data is included in the year in which the future lease with the replacement tenant expires.

(3)	Represents the monthly contractual base rent and recoveries from tenants under existing leases as of December 31, 2018 multiplied by twelve. This amount reflects total rent before any rent abatements and includes expense reimbursements, which may be estimates as of such date.

(4)	Represents the monthly contractual base rent under expiring leases with future contractual increases upon expiration and recoveries from tenants under existing leases as of December 31, 2018 multiplied by twelve. This amount reflects total rent before any rent abatements and includes expense reimbursements, which may be estimates as of such date.

(5)	Represents leases that expired on December 31, 2018.

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(1)	Represents shares of common stock of BXP surrendered by certain employees to BXP to satisfy such employees’ tax withholding obligations in connection with the vesting of restricted common stock.

(1)	Represents common units previously held by BXP that were redeemed in connection with the surrender of shares of restricted common stock of BXP by certain employees to BXP to satisfy such employees’ tax withholding obligations in connection with the vesting of restricted common stock.

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(1)

On January 1, 2016, we adopted ASU 2015-03 and retrospectively applied the guidance to our Mortgage Notes Payable and Unsecured Senior Notes for all periods presented. Unamortized deferred financing costs, with the exception of December 31, 2018, 2017 and 2016, were previously included in Total Assets totaling approximately $28.0 million and $34.5 million are now included in Total Indebtedness as of December 31, 2015 and 2014, respectively.

(2)

Pursuant to the revised definition of Funds from Operations adopted by the Board of Governors of Nareit, we calculate Funds from Operations, or “FFO,” for BXP by adjusting net income attributable to Boston Properties, Inc. common shareholders (computed in accordance with GAAP) for gains (or losses) from sales of properties, impairment losses on depreciable real estate consolidated on BXP’s balance sheet, impairment losses on our investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures and our share of real estate-related depreciation and amortization. FFO is a non-GAAP financial measure, but we believe the presentation of FFO, combined with the presentation of required GAAP financial measures, has improved the understanding of operating results of REITs among the investing public and has helped make comparisons of REIT operating results more meaningful. Management generally considers FFO to be a useful measure for understanding and comparing BXP’s operating results because, by excluding gains and losses related to sales of previously depreciated operating real estate assets, impairment losses and real estate asset depreciation and amortization (which can differ across owners of similar assets in similar condition based on historical cost accounting and useful life estimates), FFO can help investors compare the operating performance of a company’s real estate across reporting periods and to the operating performance of other companies. Amount represents BXP’s share, which was 89.83%, 89.82%, 89.70%, 89.68% and 89.81% for the years ended December 31, 2018, 2017, 2016, 2015 and 2014, respectively, after allocation to the noncontrolling interests.

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(3)	Includes the special dividends of $1.25 per share, $4.50 per share and $2.25 per share paid on January 28, 2016, January 28, 2015 and January 29, 2014, respectively, to shareholders of record as of the close of business on December 31, 2015, 2014 and 2013, respectively.

(4)

On January 1, 2018, we adopted ASU 2016-15 and ASU 2016-18 and retrospectively applied the guidance to our Consolidated Statements of Cash Flows for all periods presented. The adoption of ASU 2016-15 and ASU 2016-18 required us to include Cash Held in Escrows with Cash and Cash Equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the Consolidated Statements of Cash Flows and required us to classify debt prepayment and extinguishment costs as a component of financing activities instead of as a component of operating activities in our Consolidated Statements of Cash Flows resulting in changes to the reported amounts of cash flows provided by (used in) operating, investing and financing activities (See Note 2 to the Consolidated Financial Statements).

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(1)

On January 1, 2016, we adopted ASU 2015-03 and retrospectively applied the guidance to our Mortgage Notes Payable and Unsecured Senior Notes for all periods presented. Unamortized deferred financing costs, with the exception of December 31, 2018, 2017 and 2016, were previously included in Total Assets totaling approximately $28.0 million and $34.5 million are now included in Total Indebtedness as of December 31, 2015 and 2014, respectively.

(2)

Pursuant to the revised definition of Funds from Operations adopted by the Board of Governors of Nareit, we calculate Funds from Operations, or “FFO,” for BPLP by adjusting net income attributable to Boston Properties Limited Partnership common unitholders (computed in accordance with GAAP) for gains (or losses) from sales of properties, impairment losses on depreciable real estate consolidated on BPLP’s balance sheet, impairment losses on our investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures and our share of real estate-related depreciation and amortization. FFO is a non-GAAP financial measure, but we believe the presentation of FFO, combined with the presentation of required GAAP financial measures, has improved the understanding of operating results of REITs among the investing public and has helped make comparisons of REIT operating results more meaningful. Management generally considers FFO to be useful measures for understanding and comparing BPLP’s operating results because, by excluding gains and losses related to sales of previously depreciated operating real estate assets, impairment losses and real estate asset depreciation and amortization (which can differ across owners of similar assets in similar condition based on historical cost accounting and useful life estimates), FFO can help investors compare the operating performance of a company’s real estate across reporting periods and to the operating performance of other companies.

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(3)	Includes the special distributions of $1.25 per common unit, $4.50 per common unit and $2.25 per common unit paid on January 28, 2016, January 28, 2015 and January 29, 2014, respectively, to unitholders of record as of the close of business on December 31, 2015, 2014 and 2013, respectively.

(4)

On January 1, 2018, we adopted ASU 2016-15 and ASU 2016-18 and retrospectively applied the guidance to our Consolidated Statements of Cash Flows for all periods presented. The adoption of ASU 2016-15 and ASU 2016-18 required us to include Cash Held in Escrows with Cash and Cash Equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the Consolidated Statements of Cash Flows and required us to classify debt prepayment and extinguishment costs as a component of financing activities instead of as a component of operating activities in our Consolidated Statements of Cash Flows resulting in changes to the reported amounts of cash flows provided by (used in) operating, investing and financing activities (See Note 2 to the Consolidated Financial Statements).

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•	if there is a negative change in the economy, including, but not limited to, a reversal of current job growth trends and an increase in unemployment, it could have a negative effect on the following, among other things:

•	the fundamentals of our business, including overall market occupancy, tenant space utilization and rental rates;

•	the financial condition of our tenants, many of which are financial, legal, media/telecommunication, technology and other professional firms, our lenders, counterparties to our derivative financial instruments and institutions that hold our cash balances and short-term investments, which may expose us to increased risks of default by these parties; and

•	the value of our real estate assets, which may limit our ability to dispose of assets at attractive prices or obtain or maintain debt financing secured by our properties or on an unsecured basis;

•	volatile or adverse global economic and political conditions, and dislocations in the credit markets could adversely affect our access to cost-effective capital and have a resulting material adverse effect on our business opportunities, results of operations and financial condition;

•	general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases, tenant space utilization, dependence on tenants’ financial condition, and competition from other developers, owners and operators of real estate);

•	failure to manage effectively our growth and expansion into new markets and sub-markets or to integrate acquisitions and developments successfully;

•	the ability of our joint venture partners to satisfy their obligations;

•	risks and uncertainties affecting property development and construction (including, without limitation, construction delays, increased construction costs, cost overruns, inability to obtain necessary permits, tenant accounting considerations that may result in negotiated lease provisions that limit a tenant’s liability during construction, and public opposition to such activities);

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•	risks associated with the availability and terms of financing and the use of debt to fund acquisitions and developments or refinance existing indebtedness, including the impact of higher interest rates on the cost and/or availability of financing;

•	risks associated with forward interest rate contracts and the effectiveness of such arrangements;

•	risks associated with downturns in the national and local economies, increases in interest rates, and volatility in the securities markets;

•	risks associated with actual or threatened terrorist attacks;

•	costs of compliance with the Americans with Disabilities Act and other similar laws;

•	potential liability for uninsured losses and environmental contamination;

•	risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems, which support our operations and our buildings;

•	risks associated with BXP’s potential failure to qualify as a REIT under the Internal Revenue Code of 1986, as amended;

•	possible adverse changes in tax and environmental laws;

•	the impact of newly adopted accounting principles on our accounting policies and on period-to-period comparisons of financial results;

•	risks associated with possible state and local tax audits; and

•	risks associated with our dependence on key personnel whose continued service is not guaranteed.

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•	our understanding of tenants’ short- and long-term space utilization and amenity needs in the local markets;

•	our reputation as a premier developer, owner and manager of primarily Class A office properties;

•	our financial strength and our ability to maintain high building standards;

•	our focus on developing and operating in a sustainable and responsible manner; and

•	our relationships with local brokers.

•	ensuring tenant satisfaction;

•	leasing available space in our in-service and development properties, as well as proactively focusing on sizable future lease expirations;

•	completing the construction of our development properties;

•	continuing and completing the redevelopment and repositioning of several key properties to increase future revenue and asset values over the long-term;

•	maintaining discipline in our underwriting of investment opportunities by (1) seeking significant pre-leasing commitments before beginning new construction, and (2) targeting acquisition activity in non-stabilized assets near innovation centers where we see favorable prospects for overall growth and our operational expertise can create value; and

•	managing our near-term debt maturities and maintaining our conservative balance sheet.

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(1)	Represents leases for which rental revenue recognition has commenced in accordance to GAAP during the three and twelve months ended December 31, 2018.

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(2)

Represents leases executed during the three and twelve months ended December 31, 2018 for which we either (a) commenced rental revenue recognition in such period or (b) will commence rental revenue recognition in subsequent periods, in accordance with GAAP, and includes leases at properties currently under development. The total square feet of leases executed and recognized in the three and twelve months ended December 31, 2018 is 159,600 and 1,093,842, respectively.

(3)	Second generation leases are defined as leases for space that had previously been under lease by us. Of the 1,324,028 and 4,306,399 square feet of second generation leases that commenced during the three and twelve months ended December 31, 2018, respectively, 1,164,428 and 3,287,255 square feet were signed in prior periods for the three and twelve months ended December 31, 2018, respectively.

(4)	Total transaction costs include tenant improvements and leasing commissions, but exclude free rent concessions and other inducements in accordance with GAAP.

(5)

Represents the increase in gross rent (base rent plus expense reimbursements) on the new versus expired leases on the 879,438 and 2,990,009 square feet of second generation leases that had been occupied within the prior 12 months for the three and twelve months ended December 31, 2018, respectively; excludes leases that management considers temporary because the tenant is not expected to occupy the space on a long-term basis.

(6)

Represents the increase in net rent (gross rent less operating expenses) on the new versus expired leases on the 879,438 and 2,990,009 square feet of second generation leases that had been occupied within the prior 12 months for the three and twelve months ended December 31, 2018, respectively; excludes leases that management considers temporary because the tenant is not expected to occupy the space on a long-term basis.

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•	review relevant financial information, including:

•	financial ratios;

•	net worth;

•	revenue;

•	cash flows;

•	leverage; and

•	liquidity;

•	evaluate the depth and experience of the tenant’s management team; and

•	assess the strength/growth of the tenant’s industry.

(1)	acceptable-risk tenants;

(2)	the tenant’s credit is such that we may require collateral, in which case we:

•	may require a security deposit; and/or

•	may reduce upfront tenant improvement investments; or

(3)	the tenant’s credit is below our acceptable parameters.

•	payment history;

•	credit status and change in status (credit ratings for public companies are used as a primary metric);

•	change in tenant space needs (i.e., expansion/downsize);

•	tenant financial performance;

•	economic conditions in a specific geographic region; and

•	industry specific credit considerations.

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(1)

For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 64. Residential Net Operating Income for the year ended December 31, 2018 and 2017 are comprised of Residential Revenue of $22,551 and $16,596 less Residential Expenses of $12,604 and $6,302, respectively. Hotel Net Operating Income for the year ended December 31, 2018 and 2017 are comprised of Hotel Revenue of $49,118 and $45,603 less Hotel Expenses of $33,863 and $32,059, respectively, per the Consolidated Statements of Operations.

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(1)	Rental revenue includes termination income of approximately $2,000 and $6,000 for the years ended December 31, 2018 and 2017, respectively.

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(1)	This is the low-rise portion of 601 Lexington Avenue in New York City. Rental revenue includes termination income of approximately $5,000 and $(1.4) million for the years ended December 31, 2018 and 2017, respectively. In addition, real estate operating expenses for the year ended December 31, 2017 includes approximately $5.8 million of demolition costs.

(2)	Real estate operating expenses for the year ended December 31, 2017 includes approximately $2.8 million of demolition costs.

(3)	On April 6, 2017, we commenced the development of 145 Broadway, a build-to-suit Class A office project with approximately 485,000 net rentable square feet located in Cambridge, Massachusetts. Real estate operating expenses for the year ended December 31, 2017 includes approximately $0.8 million of demolition costs.

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(1)	Rental revenue includes termination income of approximately $5,000 for the year ended December 31, 2017.

(2)	Rental revenue includes termination income of approximately $2.0 million for each of the years ended December 31, 2018 and 2017.

(1)	Average Monthly Rental Rate is calculated as the average of the quotients obtained by dividing (A) rental revenue as determined in accordance with GAAP, by (B) the number of occupied units for each month within the applicable fiscal period.

(2)	Average Physical Occupancy is defined as (1) the average number of occupied units divided by (2) the total number of units, expressed as a percentage.

(3)

Average Economic Occupancy is defined as (1) total possible revenue less vacancy loss divided by (2) total possible revenue, expressed as a percentage. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are

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(1)	Excludes approximately $2.6 million of gains on sales of real estate recognized during the year ended December 31, 2018 related to gain amounts from sales of real estate occurring in prior years.

(2)	The gain on sale of real estate for this property was $28,000.

(3)	Excludes approximately $1.1 million of gains on sale of real estate recognized during the year ended December 31, 2017 related to a previously deferred gain amount from sales of real estate occurring in prior years.

(1)	Excludes approximately $2.6 million of gains on sales of real estate recognized during the year ended December 31, 2018 related to gain amounts from sales of real estate occurring in prior years.

(2)	Excludes approximately $1.1 million of gains on sale of real estate recognized during the year ended December 31, 2017 related to a previously deferred gain amount from sales of real estate occurring in prior years.

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(1)	See Note 8 to the Consolidated Financial Statements.

(2)

The related interest expense from the Outside Members’ Notes Payable totaled approximately $16.3 million for the year ended December 31, 2017. These amounts are allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in our Consolidated Statements of Operations. On June 7, 2017, a portion of the outside members’ notes payable was repaid and the remaining portion was contributed as equity in the consolidated entity.

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(1)	See Notes 10 and 19 to the Consolidated Financial Statements.

(2)

On June 7, 2017, our consolidated entity in which we have a 60% interest completed the refinancing of indebtedness that had been secured by direct and indirect interests in 767 Fifth Avenue. The net loss allocation was primarily due to the partners’ share of the interest expense for the outside members’ notes payable which was $16.3 million for the year ended December 31, 2017. However, during the year ended December 31, 2017, we recognized a net gain from early extinguishment of debt totaling approximately $14.6 million primarily consisting of the acceleration of the remaining balance related to the historical fair value debt adjustments and as a result, this contributed to the property having a reduced net loss allocation. In addition, during the year ended December 31, 2017, we accelerated the depreciation and amortization related to capital improvements being performed at the building and had approximately $14.2 million of termination income. Neither of these items reoccurred during the year ended December 31, 2018.

(3)

On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns this property commenced the redevelopment of the six-story low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We will capitalize incremental costs during the redevelopment. In addition, real estate operating expenses for the year ended December 31, 2017 included approximately $5.8 million of demolition costs, which did not reoccur during the year ended December 31, 2018.

(4)	The year ended December 31, 2018 included an increase in rental revenue from our tenants.

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(1)	The change in the Same Property Portfolio was driven by the decrease in termination income. For additional information, see page 79.

(2)

For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 64. Residential Net Operating Income for the year ended December 31, 2017 and 2016 are comprised of Residential Revenue of $16,596 and $16,699 less Residential Expenses of $6,302 and $7,076, respectively. Hotel Net Operating Income for the year ended December 31, 2017 and 2016 are comprised of Hotel Revenue of $45,603 and $44,884 less Hotel Expenses of $32,059 and $31,466, respectively, per the Consolidated Statements of Operations.

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(1)	Rental revenue includes termination income of approximately $6,000 for the year ended December 31, 2017.

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(1)

This is the low-rise portion of 601 Lexington Avenue in New York City. Rental revenue includes termination income of approximately $(1.4) million and $(0.9) million for the years ended December 31, 2017 and 2016, respectively. In addition, real estate operating expense includes demolition costs of approximately $5.8 million and $2.3 million for the years ended December 31, 2017 and 2016, respectively.

(2)	Real estate operating expenses includes demolition costs of approximately $2.8 million and $0.3 million for the years ended December 31, 2017 and 2016, respectively.

(3)	On April 6, 2017, we commenced the development of 145 Broadway, a build-to-suit Class A office project with approximately 485,000 net rentable square feet located in Cambridge, Massachusetts. Real estate operating expenses for the year ended December 31, 2017 includes approximately $0.8 million of demolition costs.

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(1)	Average Monthly Rental Rate is calculated as the average of the quotients obtained by dividing (A) rental revenue as determined in accordance with GAAP, by (B) the number of occupied units for each month within the applicable fiscal period.

(2)	Average Physical Occupancy is defined as (1) the average number of occupied units divided by (2) the total number of units, expressed as a percentage.

(3)

Average Economic Occupancy is defined as (1) total possible revenue less vacancy loss divided by (2) total possible revenue, expressed as a percentage. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Trends in market rents for a region as reported by others could vary. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.

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(1)	We commenced several repositioning and capital improvement projects during the year ended December 31, 2016 and as a result accelerated depreciation and amortization on the portion of the building that was being repositioned or undergoing capital improvements.

(2)

On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns 601 Lexington Avenue located in New York City commenced the redevelopment of the six-story, low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. As a result, during the year ended December 31, 2016, we recorded approximately $50.8 million, including $3.2 million related to the step-up of real estate assets, of accelerated depreciation expense for the portion of the complex that was demolished.

(1)	We commenced several repositioning and capital improvement projects during the year ended December 31, 2016 and as a result accelerated depreciation and amortization on the portion of the building that was being repositioned or undergoing capital improvements.

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(2)

On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns 601 Lexington Avenue located in New York City commenced the redevelopment of the six-story, low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We recorded approximately $47.6 million of accelerated depreciation expense for the portion of the complex that was demolished.

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(1)	The gain on sale of real estate for this property was $28,000.

(2)	Excludes approximately $1.1 million of gains on sale of real estate recognized during the year ended December 31, 2017 related to a previously deferred gain amount from sales of real estate occurring in prior years.

(3)	Excludes approximately $6.8 million of a gain on sale of real estate recognized during the year ended December 31, 2016 related to a previously deferred gain amount from the 2014 sale of Patriots Park located in Reston, Virginia.

(1)	Excludes approximately $1.1 million of gains on sale of real estate recognized during the year ended December 31, 2017 related to a previously deferred gain amount from sales of real estate occurring in prior years.

(2)	Excludes approximately $6.8 million of a gain on sale of real estate recognized during the year ended December 31, 2016 related to a previously deferred gain amount from the 2014 sale of Patriots Park located in Reston, Virginia.

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(1)	See Note 8 to the Consolidated Financial Statements.

(2)	Includes the repayment of the mortgage loans collateralized by Fountain Square, Embarcadero Center Four and 599 Lexington Avenue.

(3)	The increase was primarily due to the commencement and continuation of several development projects.

(4)

The related interest expense from the Outside Members’ Notes Payable totaled approximately $16.3 million and $34.3 million for the years ended December 31, 2017 and 2016, respectively. These amounts are allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in our Consolidated Statements of Operations. On June 7, 2017, a portion of the outside members’ notes payable was repaid and the remaining portion was contributed as equity in the consolidated entity (See Note 10 to the Consolidated Financial Statements).

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(1)	See Notes 10 and 19 to the Consolidated Financial Statements.

(2)

On June 7, 2017, our consolidated entity in which we have a 60% interest completed the refinancing of indebtedness that had been secured by direct and indirect interests in 767 Fifth Avenue. The net loss allocation was primarily due to the partners’ share of the interest expense for the outside members’ notes payable which was $16.3 million and $34.3 million for the years ended December 31, 2017 and 2016, respectively. On June 7, 2017, a portion of the outside members’ notes payable was repaid and the remaining portion was contributed as equity in the consolidated entity (See Note 10 to the Consolidated Financial Statements).

(3)

On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns this property commenced the redevelopment of the six-story low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We will capitalize incremental costs during the redevelopment. BXP and BPLP recognized approximately $50.8 million and $47.6 million, respectively, of depreciation expense associated with the acceleration of depreciation on the assets being removed from service and demolished as part of the redevelopment of the property. Approximately $21.4 million of those amounts was allocated to the outside partners.

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•	fund normal recurring expenses;

•	meet debt service and principal repayment obligations, including balloon payments on maturing debt;

•	fund development/redevelopment costs;

•	fund capital expenditures, including major renovations, tenant improvements and leasing costs;

•	fund planned and possible acquisitions of properties, either directly or indirectly through the acquisition of equity interests therein, including the acquisition price and promote payment to our partner for its 5% interest in Salesforce Tower;

•	fund dividend requirements on BXP’s Series B Preferred Stock; and

•	make the minimum distribution required to enable BXP to maintain its REIT qualification under the Internal Revenue Code of 1986, as amended.

•	cash flow from operations;

•	distribution of cash flows from joint ventures;

•	cash and cash equivalent balances;

•	BPLP’s 2017 Credit Facility and other short-term bridge facilities;

•	construction loans;

•	long-term secured and unsecured indebtedness (including unsecured exchangeable indebtedness);

•	sales of real estate; and

•	issuances of BXP equity securities and/or additional preferred or common units of partnership interest in BPLP.

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(1)	Represents our share.

(2)	Investment to Date, Estimated Total Investment and Estimated Future Equity Requirement all include our share of acquisition expenses, as applicable, and reflect our share of the estimated net revenue/expenses that we expect to incur prior to stabilization of the project, including any amounts actually received or paid through December 31, 2018.

(3)	Includes approximately $78.7 million of unpaid but accrued construction costs and leasing commissions.

(4)	Excludes approximately $78.7 million of unpaid but accrued construction costs and leasing commissions.

(5)	Represents percentage leased as of February 22, 2019, including leases with future commencement dates.

(6)	Project is subject to a 99-year ground lease (including extension options) with an option to purchase in the future.

(7)	The increase in the Estimated Total Investment relates primarily to the costs of executing a thirty-year lease on all of the office space plus costs associated with enhancements to the retail component of the project.

(8)	Percentage leased excludes residential units.

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(1)	On May 15, 2017, we acquired 103 Carnegie Center located in Princeton, New Jersey for a purchase price of approximately $16.0 million in cash, including transaction costs.

(2)

Construction in progress for the year ended December 31, 2018 includes ongoing expenditures associated with 191 Spring Street, Salesforce Tower, Signature at Reston and Proto Kendall Square, which were fully placed in-service during the year ended December 31, 2018. In addition, we incurred costs associated with our continued development/redevelopment of One Five Nine East 53rd Street, 145 Broadway, 20 CityPoint, 17Fifty Presidents Street, 6595 Springfield Center Drive, Reston Gateway and MacArthur Station Residences.

(3)

On January 9, 2018, we completed the sale of our 500 E Street, S.W. property located in Washington, DC for a net contract sale price of approximately $118.6 million. Net cash proceeds totaled approximately $116.1 million, resulting in a gain on sale of real estate totaling approximately $96.4 million for BXP and approximately $98.9 million for BPLP. 500 E Street, S.W. is an approximately 262,000 net rentable square foot Class A office property.

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(4)	Capital contributions to unconsolidated joint ventures for the year ended December 31, 2018 consisted primarily of cash contributions of approximately $189.1 million, $47.6 million, $46.9 million, $46.3 million and $11.0 million to our Santa Monica Business Park, 7750 Wisconsin Avenue, 3 Hudson Boulevard, Hub on Causeway and Dock 72 joint ventures, respectively.

(5)	Capital distributions from unconsolidated joint ventures for the year ended December 31, 2017 consisted of a cash distribution of $251.0 million from our Colorado Center joint venture resulting from the proceeds of the new mortgage financing.

(6)	Deposit on capital lease reflects the cash deposit made on the portion of the Platform 16 ground lease for which the land was not available for lease from the lessor (See Notes 3 and 19 to the Consolidated Financial Statements).

(7)	Issuance of related party note receivable consisted of the $80.0 million of mortgage financing that we provided to our unconsolidated joint venture that owns 3 Hudson Boulevard in New York City. The financing bears interest at a variable rate equal to LIBOR plus 3.50% per annum and matures on July 13, 2023, with extension options, subject to certain conditions.

(8)	Issuance of note receivable consisted of the $21.0 million of seller financing provided by us to the buyer in connection with the sale of land at our Tower Oaks property located in Rockville, Maryland, which is collateralized by a portion of the land parcel, bears interest at an effective rate of 1.92% per annum and matures on December 20, 2021.

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(1)	Except for the Series B Cumulative Redeemable Preferred Stock, which is valued at the liquidation preference of $2,500 per share, values are based on the closing price per share of BXP’s Common Stock on December 31, 2018 of $112.55.

(2)	Includes 991,577 long-term incentive plan units (including 118,067 2012 OPP Units, 68,889 2013 MYLTIP Units, 23,187 2014 MYLTIP Units and 28,724 2015 MYLTIP Units), but excludes MYLTIP Units granted between 2016 and 2018.

(3)	See page 109 for additional information.

(4)	See page 99 for additional information.

(i)	the number of outstanding shares of common stock of BXP,

(ii)	the number of outstanding OP Units in BPLP (excluding OP Units held by BXP),

(iii)	the number of OP Units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, and

(iv)	the number of OP Units issuable upon conversion of 2012 OPP Units, 2013 MYLTIP Units, 2014 MYLTIP Units and 2015 MYLTIP Units that were issued in the form of LTIP Units; and

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(1)	See page 109 for additional information.

(2)	See page 99 for additional information.

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(1)	GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges and the effects of hedging transactions.

(2)	The mortgage loan requires interest only payments with a balloon payment due at maturity.

(3)	This property is owned by a consolidated entity in which we have a 60% interest. The partners' share of the carrying amount has been adjusted for basis differentials.

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(4)

In connection with the refinancing of the loan, we guaranteed the consolidated entity’s obligation to fund various reserves for tenant improvement costs and allowances, leasing commissions and free rent obligations in lieu of cash deposits. As of December 31, 2018, the maximum funding obligation under the guarantee was approximately $116.1 million. We earn a fee from the joint venture for providing the guarantee and have an agreement with our partners to reimburse the joint venture for their share of any payments made under the guarantee (See Note 9 to the Consolidated Financial Statements).

(5)	This property is owned by a consolidated entity in which we have a 55% interest.

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(1)	The gain on sale of investment in unconsolidated joint venture consists of the gain on sale of a 31% interest in Metropolitan Square. We continue to own a 20% interest in the joint venture.

(2)	Consists of the portion of income from unconsolidated joint ventures related to the gain on the distribution of Annapolis Junction Building One.

(3)	For the year ended December 31, 2015, excludes the noncontrolling interests in property partnerships’ share of a gain on sale of real estate totaling approximately $101.1 million.

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(1)	BXP’s share of diluted Funds from Operations was 89.84%, 89.83%, 89.72%, 89.70% and 89.84% for the years ended December 31, 2018, 2017, 2016, 2015 and 2014, respectively.

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(1)	The gain on sale of investment in unconsolidated joint venture consists of the gain on sale of a 31% interest in Metropolitan Square. We continue to own a 20% interest in the joint venture.

(2)	Consists of the portion of income from unconsolidated joint ventures related to the gain on the distribution of Annapolis Junction Building One.

(3)	For the year ended December 31, 2015, excludes the noncontrolling interests in property partnerships’ share of a gain on sale of real estate totaling approximately $101.1 million.

(4)	Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units, vested 2013 MYLTIP Units, vested 2014 MYLTIP Units and vested 2015 MYLTIP Units).

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(1)	Amounts include principal and interest payments.

(2)	Interest payments are calculated using the December 31, 2018 interest rate of 3.27%.

(3)	Committed tenant-related obligations based on executed leases as of December 31, 2018 (tenant improvements and lease commissions).

(4)	Includes 100% of the obligations for our consolidated entities and only our share for the unconsolidated joint ventures.

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(1)	GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges, which includes mortgage recording fees.

(2)	The loan requires interest only payments with a balloon payment due at maturity.

(3)	Mortgage loan bears interest at a variable rate equal to LIBOR plus 1.10% per annum.

(4)	The loan bears interest at a variable rate equal to LIBOR plus 1.28% per annum and matures on July 19, 2025. A subsidiary of the joint venture entered into interest rate swap contracts with notional amounts aggregating $300.0 million through April 1, 2025, resulting in a fixed rate of approximately 4.063% per annum through the expiration of the interest rate swap contracts.

(5)	The loan bears interest at a variable rate equal to LIBOR plus 2.00% per annum and matures on November 17, 2019, with one, one-year extension option, subject to certain conditions. On January 24, 2019, the joint venture extended the loan maturity to November 17, 2020.

(6)	The loan bears interest at a variable rate equal to LIBOR plus 2.35% per annum and matures on December 7, 2019, with three, one-year extension options, subject to certain conditions.

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(7)	The construction financing bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on December 18, 2020 with two, one-year extension options, subject to certain conditions.

(8)

The construction financing bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on September 6, 2021, with two, one-year extension options, subject to certain conditions. In connection with the construction financing, we obtained the right to complete the construction of the garage underneath the project being developed by an affiliate of our joint venture partner and obtain funding from the garage construction lender.  We agreed to guarantee completion of the garage to the construction lender and an affiliate of our partner agreed to reimburse us for our partner’s share of any payments under the guarantee.

(9)	The construction financing bears interest at a variable rate equal to LIBOR plus 2.00% per annum and matures on April 19, 2022, with two, one-year extension options, subject to certain conditions.

(10)	We provided $80.0 million of mortgage financing to the joint venture. The loan bears interest at a variable rate equal to LIBOR plus 3.50% per annum and matures on July 13, 2023, with extension options, subject to certain conditions. The loan has been reflected as Related Party Note Receivable on our Consolidated Balance Sheets.

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(1)	Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties, Inc.’s Consolidated Statements of Operations.

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(1)	Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties Limited Partnership's Consolidated Statements of Operations.

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•	common units of partnership interest (also referred to as “OP Units”),

•	long term incentive units of partnership interest (also referred to as “LTIP Units”), and

•	preferred units of partnership interest (also referred to as “Preferred Units”).

•	178 office properties (including nine properties under construction/redevelopment);

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•	twelve retail properties;

•	six residential properties (including two properties under construction); and

•	one hotel.

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(1)	The fourth quarter 2018 regular quarterly dividend was $0.95 per common share of which approximately $0.69 per common share was allocable to 2018 and approximately $0.26 per common share is allocable to 2019.

(2)	The fourth quarter 2017 regular quarterly dividend was $0.80 per common share of which approximately $0.47 per common share was allocable to 2017 and approximately $0.33 per common share is allocable to 2018.

(3)	The fourth quarter 2016 regular quarterly dividend was $0.75 per common share of which approximately $0.56 per common share was allocable to 2016 and approximately $0.19 per common share is allocable to 2017.

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(1)	Includes pre-development costs.

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(1)	Includes pre-development costs.

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(1)	Investments with deficit balances aggregating approximately $25.1 million and $25.9 million at December 31, 2018 and 2017, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

(2)	The Company’s economic ownership has increased based on the achievement of certain return thresholds.

(3)	The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.3% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.

(4)	The joint venture owns three in-service buildings and two undeveloped land parcels.

(5)	Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

(6)	This entity is a VIE (See Note 1).

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(1)

This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. At December 31, 2018 and 2017, there was an aggregate basis differential of approximately $316.7 million and $322.5 million, respectively, between the carrying value of the Company’s investment in the joint venture that owns Colorado Center and the joint venture’s basis in the assets and liabilities, which differential (excluding land) shall be amortized over the remaining lives of the related assets and liabilities.

(2)	Investments with deficit balances aggregating approximately $25.1 million and $25.9 million at December 31, 2018 and 2017, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

(1)	Includes straight-line rent adjustments of approximately $15.9 million, $21.7 million and $18.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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(2)	During the year ended December 31, 2018, the joint venture that owns Metropolitan Square in Washington, DC, commenced a renovation project and recorded accelerated depreciation expense of approximately $22.4 million related to the remaining book value of the assets to be replaced. The Company's share of the accelerated depreciation expense totaled approximately $4.5 million.

(3)	Includes straight-line rent adjustments of approximately $2.4 million, $1.9 million and $1.4 million for the years ended December 31, 2018, 2017 and 2016, respectively. Also includes net above-/below-market rent adjustments of approximately $1.6 million, $2.9 million and $0.9 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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(1)	Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.

(2)	No principal amounts are due prior to maturity.

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(1)	Includes the contribution of the remaining unpaid principal balance of the members’ notes payable totaling $109,576 to equity in the consolidated entity that owns 767 Fifth Avenue (the General Motors Building).

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(1)	Includes information related to BXP’s 1997 Plan and 2012 Plan.

(2)

Includes (a) 540,441 shares of common stock issuable upon the exercise of outstanding options (all of which are vested and exercisable), (b) 991,577 long term incentive units (LTIP units) (682,077 of which are vested) that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (c) 1,292,734 common units issued upon conversion of LTIP units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (d) 471,579 2016 MYLTIP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (e) 398,871 2017 MYLTIP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (f) 341,366 2018 MYLTIP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock and (g) 74,966 deferred stock units which were granted pursuant to elections by certain of BXP’s non-employee directors to defer all cash compensation to be paid to such directors and to receive their deferred cash compensation in shares of BXP’s common stock upon their retirement from its Board of Directors. Does not include 50,142 shares of restricted stock, as they have been reflected in BXP’s total shares outstanding. Because there is no exercise price associated with LTIP units, common units, 2016 MYLTIP Awards, 2017 MYLTIP Awards, 2018 MYLTIP Awards or deferred stock units, such shares are not included in the weighed-average exercise price calculation.

(3)	Represents awards available for issuance under BXP’s 2012 Plan. “Full-value” awards (i.e., awards other than stock options) are multiplied by a 2.32 conversion ratio to calculate the number of shares available under the 2012 Plan that are used for each full-value award, as opposed to a 1.0 conversion ratio for each stock option awarded under the 2012 Plan.

(4)

Includes information related to the 1999 Non-Qualified Employee Stock Purchase Plan (ESPP). The ESPP was adopted by the Board of Directors of BXP on October 29, 1998. The ESPP has not been approved by BXP’s stockholders. The ESPP is available to all our employees that are employed on the first day of the purchase period. Under the ESPP, each eligible employee may purchase shares of our common stock at semi-annual intervals each year at a purchase price equal to 85% of the average closing prices of our common stock on the New York Stock Exchange during the last ten business days of the purchase period. Each eligible employee may contribute no more than $10,000 per year to purchase our common stock under the ESPP.

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(1)	Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2)	Includes unamortized deferred financing costs totaling approximately $(30.8) million.

(3)	Includes pre-development costs.

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(1)	Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2)	Includes unamortized deferred financing costs totaling approximately $(30.8) million.

(3)	Includes pre-development costs.

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