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Table of Contents X 0 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Boston Properties , Inc. BOSTON PROPERTIES , INC . BOSTON PROPERTIES LIMITED PARTNERSHIP ( Exact name of Registrants as specified in its charter ) Boston Properties Limited Partnership Registrant Boston Properties , Inc. Boston Properties , Inc. Commission File Number : 1-13087 ( Boston Properties , Inc. ) Commission File Number : 0-50209 ( Boston Properties Limited Partnership ) to Delaware ( State or other jurisdiction of incorporation or organization ) Delaware ( State or other jurisdiction of incorporation or organization ) ( 617 ) 236-3300 ( Registrants ' telephone number , including area code ) Prudential Center , 800 Boylston Street , Suite 1900 , Boston , Massachusetts 02199-8103 ( Address of principal executive offices ) ( Zip Code ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Trading Symbol ( s ) BXP Common Stock , par value $ .01 per share Depository Shares Each Representing 1 / 100th of a share of 5.25 % Series B Cumulative Redeemable Preferred Stock , par value $ 0.01 per share Boston Properties Limited Partnership BXP PRB Securities registered pursuant to Section 12 ( g ) of the Act : Registrant 04-2473675 ( I.R.S. Employer Identification Number ) 04-3372948 ( I.R.S. Employer Identification Number ) Title of each class Units of Limited Partnership Name of each exchange on which registered New York Stock Exchange New York Stock Exchange