Exhibit 21.1
All of the following are subsidiaries of both Boston Properties, Inc. and Boston Properties Limited Partnership, except Boston Properties Limited Partnership is only a subsidiary of Boston Properties, Inc.
| Entity Name | State of Organization | |
| 100 Federal JV LLC | Delaware | |
| 100 Federal Subsidiary REIT LLC | Delaware | |
| 100 Federal TRS LLC | Delaware | |
| 101 Carnegie Center Associates | New Jersey | |
| 1265 Main Office JV LLC | Delaware | |
| 1265 Main Office Subsidiary LLC | Delaware | |
| 1330 Connecticut Fitness Center TRS LLC | Delaware | |
| 17M Associates | District of Columbia | |
| 191 Spring Street Trust | Massachusetts | |
| 206 Associates Limited Partnership | New Jersey | |
| 210 Associates Limited Partnership | New Jersey | |
| 211 Associates Limited Partnership | New Jersey | |
| 30 Shattuck Road LLC | Delaware | |
| 347 Madison Avenue Venture, LLC | Delaware | |
| 399 Services LLC | Delaware | |
| 40-46 Harvard Street Trust | Massachusetts | |
| 500 North Capitol LLC | Delaware | |
| 500 North Capitol Venture LLC | Delaware | |
| 501 K Street LLC | Delaware | |
| 501 K Street Property Owner LLC | Delaware | |
| 540 Land Partners LLC | Delaware | |
| 540 Madison Partners LLC | Delaware | |
| 540 Madison Venture LLC | Delaware | |
| 601 Mass Fitness Center TRS LLC | Delaware | |
| 635 Mass Ave LLC | Delaware | |
| 767 Fifth Junior Mezz LLC | Delaware | |
| 767 Fifth Lender LLC | Delaware | |
| 767 Fifth Partners LLC | Delaware | |
| 767 Fifth Senior Mezz LLC | Delaware | |
| 767 Fifth TRS LLC | Delaware | |
| 767 Venture, LLC | Delaware | |
| 7750 Wisconsin Avenue LLC | Delaware | |
| 7750 Wisconsin Avenue Property Owner LLC | Delaware | |
| 90 Church Street Limited Partnership | Delaware | |
| 901 New York Avenue Fitness Center LLC | Delaware | |
| 901 New York LLC | Delaware | |
| 901 New York REIT LLC | Delaware | |
| 91 Hartwell Avenue Trust | Massachusetts | |
| 92 Hayden Avenue Trust | Massachusetts | |
| AJ Lot 2R Financing LLC | Delaware | |
| AJ Lot 2R LLC | Delaware | |
| AJ Lot 3R Financing LLC | Delaware | |
| AJ Lot 3R LLC | Delaware | |
| Entity Name | State of Organization | |
| AJ Lot 6 Financing LLC | Delaware | |
| AJ Lot 6 LLC | Delaware | |
| AJ Lot 7R LLC | Delaware | |
| AJ Lot 8 LLC | Delaware | |
| Annapolis Junction NFM LLC | Delaware | |
| Atlantic Wharf JV LLC | Delaware | |
| Atlantic Wharf Subsidiary REIT LLC | Delaware | |
| Big Apple Associates Limited Partnership | Delaware | |
| Block 4 LLC | Delaware | |
| BNY Tower Associates LLC | Delaware | |
| BNY Tower Holdings LLC | Delaware | |
| BNYTA Amenity Operator LLC | Delaware | |
| Boston Properties Limited Partnership | Delaware | |
| Boston Properties LLC | Delaware | |
| Boston Properties Management, Inc. | Delaware | |
| Boston Properties Services, LLC | Delaware | |
| Boston Properties TRS, Inc. | Delaware | |
| BP 10 CityPoint Cafe LLC | Delaware | |
| BP 103 Fourth Avenue LLC | Delaware | |
| BP 111 Huntington Ave LLC | Delaware | |
| BP 1265 Main LLC | Delaware | |
| BP 1330 Connecticut Avenue LLC | Delaware | |
| BP 1333 New Hampshire Avenue LLC | Delaware | |
| BP 140 Kendrick Street Cafe LLC | Delaware | |
| BP 140 Kendrick Street LLC | Delaware | |
| BP 140 Kendrick Street Property LLC | Delaware | |
| BP 17 Hartwell LLC | Delaware | |
| BP 201 Spring Street LLC | Delaware | |
| BP 230 City Point Cafe LLC | Delaware | |
| BP 347 Madison Associates, LLC | Delaware | |
| BP 347 Madison Developer LLC | Delaware | |
| BP 399 Park Avenue LLC | Delaware | |
| BP 3HB Developer LLC | Delaware | |
| BP 3HB Lender LLC | Delaware | |
| BP 3HB Member LLC | Delaware | |
| BP 500 North Capitol LLC | Delaware | |
| BP 501 K Street Member LLC | Delaware | |
| BP 510 Madison Ave LLC | Delaware | |
| BP 510 Madison HC LLC | Delaware | |
| BP 510 Madison LLC | Delaware | |
| BP 540 Madison LLC | Delaware | |
| BP 599 Lexington Avenue LLC | Delaware | |
| BP 767 Fifth LLC | Delaware | |
| BP 888 Boylston LLC | Delaware | |
| BP 99 Third Avenue LLC | Delaware | |
| BP Atlantic Wharf Master Tenant LLC | Delaware | |
| BP AW Garage LLC | Delaware | |
| BP AW Retail LLC | Delaware | |
| BP AW Tower Office LLC | Delaware | |
| Entity Name | State of Organization | |
| BP AW Waterfront Office LLC | Delaware | |
| BP AWRR Trustee I LLC | Delaware | |
| BP AWRR Trustee II LLC | Delaware | |
| BP AWTO Trustee I LLC | Delaware | |
| BP AWTO Trustee II LLC | Delaware | |
| BP AWTO Trustee III LLC | Delaware | |
| BP Bay Colony Cafe LLC | Delaware | |
| BP Bay Colony HC LLC | Delaware | |
| BP Bay Colony Holdings LLC | Delaware | |
| BP Bay Colony LLC | Delaware | |
| BP Bedford Street Cafe LLC | Delaware | |
| BP Belvidere LLC | Delaware | |
| BP Cambridge Center Residential LLC | Delaware | |
| BP CGC II Retail Operator LLC | Delaware | |
| BP CityPoint Association Member LLC | Delaware | |
| BP Crane Meadow, L.L.C. | Delaware | |
| BP East Garage LLC | Delaware | |
| BP EC1 Holdings LLC | Delaware | |
| BP EC2 Holdings LLC | Delaware | |
| BP EC3 Holdings LLC | Delaware | |
| BP EC4 Holdings LLC | Delaware | |
| BP Federal Street LLLC | Delaware | |
| BP Five CC LLC | Delaware | |
| BP Four CC LLC | Delaware | |
| BP Fourth Avenue Cafe LLC | Delaware | |
| BP Fourth Avenue, LLC | Delaware | |
| BP Hancock LLC | Delaware | |
| BP Hancock Parking LLC | Delaware | |
| BP Hartwell Avenue Cafe LLC | Delaware | |
| BP Hayden Avenue Cafe LLC | Delaware | |
| BP Hotel JV Member LLC | Delaware | |
| BP Hotel LLC | Delaware | |
| BP II LLC | Delaware | |
| BP III LLC | Delaware | |
| BP Jones Road Cafe LLC | Delaware | |
| BP Kingstowne Office Building K LLC | Delaware | |
| BP Kingstowne Office Building T LLC | Delaware | |
| BP Kingstowne Theatre LLC | Delaware | |
| BP LOP LLC | Delaware | |
| BP Mall Road Cafe LLC | Delaware | |
| BP Management, L.P. | Delaware | |
| BP Market Square North GP LLC | Delaware | |
| BP Mill Road Cafe LLC | Delaware | |
| BP Navy Yard Member LLC | Delaware | |
| BP Navy Yard TRS LLC | Delaware | |
| BP New Dominion Technology Park II LLC | Delaware | |
| BP New York LLC | Delaware | |
| BP Office JV Member LLC | Delaware | |
| Entity Name | State of Organization | |
| BP Podium JV Member LLC | Delaware | |
| BP Prospect Place LLC | Delaware | |
| BP Prucenter Acquisition LLC | Delaware | |
| BP Prucenter Development LLC | Delaware | |
| BP Prucenter Exeter LLC | Delaware | |
| BP Prucenter Fairfield LLC | Delaware | |
| BP RB Developer LLC | Delaware | |
| BP Realty New Jersey, LLC | New Jersey | |
| BP Realty Washington LLC | Delaware | |
| BP Reservoir Place Cafe LLC | Delaware | |
| BP Reservoir Place Fitness LLC | Delaware | |
| BP Reservoir Place LLC | Delaware | |
| BP Residential JV Member LLC | Delaware | |
| BP Reston Eastgate, LLC | Delaware | |
| BP RTC Member LLC | Delaware | |
| BP Russia Building LLC | Delaware | |
| BP Russia Wharf LLC | Delaware | |
| BP Services TRS LLC | Delaware | |
| BP Seven Cambridge Center LLC | Delaware | |
| BP Seventeen Cambridge Center LLC | Delaware | |
| BP Spring Street Cafe LLC | Delaware | |
| BP Supermarket LLC | Delaware | |
| BP Third Avenue LLC | Delaware | |
| BP Times Square Tower Mezzanine LLC | Delaware | |
| BP West Street Cafe LLC | Delaware | |
| BP Weston Quarry LLC | Delaware | |
| BP Weston Quarry Residential LLC | Delaware | |
| BP/CGCenter I LLC | Delaware | |
| BP/CGCenter II LLC | Delaware | |
| BP/CGCenter MM LLC | Delaware | |
| BP/CRF 901 New York Avenue LLC | Delaware | |
| BP/CRF Metropolitan Square LLC | Delaware | |
| BP/DC 767 Fifth LLC | Delaware | |
| BP/DC Properties, Inc. | Maryland | |
| BP/DC REIT LLC | Delaware | |
| BP/M 3HB Owner LLC | Delaware | |
| BP-AJ LLC | Delaware | |
| BPI EC4 LLC | Delaware | |
| BPLP SMBP GP LLC | Delaware | |
| BPLP SMBP LP LLC | Delaware | |
| BP-M 3HB Holdco LLC | Delaware | |
| BP-M 3HB Mezz LLC | Delaware | |
| BP-M 3HB Venture LLC | Delaware | |
| BPNS Garage General LLC | Delaware | |
| BPNS Garage Limited LLC | Delaware | |
| BPNS Hotel General LLC | Delaware | |
| BPNS Hotel Limited LLC | Delaware | |
| BPNS Office General LLC | Delaware | |
| Entity Name | State of Organization | |
| BPNS Office Limited LLC | Delaware | |
| BPNS Podium General LLC | Delaware | |
| BPNS Podium Limited LLC | Delaware | |
| BPNS Residential General LLC | Delaware | |
| BPNS Residential Limited LLC | Delaware | |
| BNYTA Amenity Operator LLC | Delaware | |
| BP-WP Project Developer Manager LLC | Delaware | |
| BXP 17Fifty LLC | Delaware | |
| BXP 2100 Penn LLC | Delaware | |
| BXP 601 & 651 Gateway Center LP | Delaware | |
| BXP 611 Gateway Center LP | Delaware | |
| BXP 7750 Wisconsin Avenue LLC | Delaware | |
| BXP Almaden Associates LP | Delaware | |
| BXP Beach Cities LLC | Delaware | |
| BXP California GP LLC | Delaware | |
| BXP Carnegie Center LLC | Delaware | |
| BXP Colorado GP LLC | Delaware | |
| BXP Colorado LP LLC | Delaware | |
| BXP Folsom-Hawthorne LP | Delaware | |
| BXP Gateway GP LLC | Delaware | |
| BXP Gateway Member LLC | Delaware | |
| BXP Harrison LLC | Delaware | |
| BXP MacArthur LLC | Delaware | |
| BXP Mission 535 LP | Delaware | |
| BXP North First LP | Delaware | |
| BXP Peterson LP | Delaware | |
| BXP Platform 16 GP LLC | Delaware | |
| BXP Platform 16 LP LLC | Delaware | |
| BXP Ravendale LP | Delaware | |
| BXP Research Park LP | Delaware | |
| BXP TB Development LLC | Delaware | |
| BXP Transbay Management LLC | Delaware | |
| BXP Waltham Woods LLC | Delaware | |
| BXP West El Camino LP | Delaware | |
| BXP Zanker Road LP | Delaware | |
| CA-Colorado Center Limited Partnership | Delaware | |
| CA-Colorado Center TRS LLC | Delaware | |
| CA-Colorado Center, L.L.C. | Delaware | |
| Cambridge Center North Trust | Massachusetts | |
| Cambridge Center West Garage LLC | Delaware | |
| Cambridge Center West Trust | Massachusetts | |
| Carnegie 103 Associates, LLC | Delaware | |
| Carnegie 214 Associates Limited Partnership | New Jersey | |
| Carnegie 408 Associates, LLC | Delaware | |
| Carnegie 504 Associates | New Jersey | |
| Carnegie 506 Associates | New Jersey | |
| Carnegie 508 Associates | New Jersey | |
| Carnegie 510 Associates, L.L.C. | Delaware | |
| Carnegie 804 Associates, LLC | Delaware | |
| Entity Name | State of Organization | |
| Carnegie Center Associates | New Jersey | |
| Carnegie Center Cafes LLC | Delaware | |
| Carnegie Center Fitness LLC | Delaware | |
| CRF Met Square, LLC | Delaware | |
| Discovery Square, L.L.C. | Delaware | |
| Downtown Boston Properties Trust | Massachusetts | |
| Elandzee Trust | Massachusetts | |
| Eleven Cambridge Center Trust | Massachusetts | |
| Embarcadero Center Associates | California | |
| Embarcadero Center, Inc. | California | |
| Four Embarcadero Center Venture | California | |
| Fourteen Cambridge Center Trust | Massachusetts | |
| Gateway Portfolio Holdings LLC | Delaware | |
| Gateway Portfolio Member LLC | Delaware | |
| Gladden Properties LLC | Delaware | |
| Hayden Office Trust | Massachusetts | |
| Hotel Tower Developer LLC | Delaware | |
| Hotel Tower Owner GP, LLC | Delaware | |
| Hotel Tower Owner, LP | Delaware | |
| IXP, LLC | Vermont | |
| Jones Road Development Associates LLC | Delaware | |
| Lexreal Associates Limited Partnership | New York | |
| LKE BP Fourth Avenue Limited Partnership | Massachusetts | |
| Mall Road Trust | Massachusetts | |
| Market Square North Associates Limited Partnership | Delaware | |
| Market Square North Fitness Center LLC | Delaware | |
| MBZ-Lex Trust | Massachusetts | |
| Metropolitan Square Fitness Center TRS LLC | Delaware | |
| Metropolitan Square REIT LLC | Delaware | |
| Meushar Insurance IC, LLC | Vermont | |
| MGA Virginia 85-1 Limited Partnership | Virginia | |
| MGA Virginia 86-1 Limited Partnership | Virginia | |
| MGA Virginia 86-2 Limited Partnership | Virginia | |
| New Dominion Technology Corp. | Delaware | |
| New Dominion Technology Park II LLC | Delaware | |
| New Dominion Technology Park LLC | Delaware | |
| No. 1 Times Square Development LLC | Delaware | |
| No. 5 Times Square Development LLC | Delaware | |
| NY 510 Junior Mezz Lender LLC | Delaware | |
| NYXP, LLC | Vermont | |
| Ocean View Development Company Limited Partnership | District of Columbia | |
| Office Tower Developer LLC | Delaware | |
| Office Tower Owner GP, LLC | Delaware | |
| Office Tower Owner, LP | Delaware | |
| One Cambridge Center Trust | Massachusetts | |
| One Embarcadero Center Venture | California | |
| One Freedom Square, L.L.C. | Delaware | |
| One Tower Center Cafe LLC | Delaware | |
| Platform 16 Developer LLC | Delaware | |
| Entity Name | State of Organization | |
| Platform 16 Holdings LP | Delaware | |
| Platform 16 Sub LLC | Delaware | |
| Platform 16 LLC | Delaware | |
| Podium Developer LLC | Delaware | |
| Podium Owner GP, LLC | Delaware | |
| Podium Owner, LP | Delaware | |
| Princeton 202 Associates Limited Partnership | New Jersey | |
| Princeton Childcare Associates Limited Partnership | New Jersey | |
| Residential Tower Developer LLC | Delaware | |
| Residential Tower Owner GP, LLC | Delaware | |
| Residential Tower Owner, LP | Delaware | |
| Reston Corporate Center Limited Partnership | Virginia | |
| Reston Gateway Condo A/B, LLC | Delaware | |
| Reston Gateway Condo C, LLC | Delaware | |
| Reston Gateway Condo D, LLC | Delaware | |
| Reston Streets LLC | Delaware | |
| Reston Town Center JV LLC | Delaware | |
| Reston Town Center Office Park Phase One Limited Partnership | Virginia | |
| Reston Town Center Property LLC | Delaware | |
| Reston VA 939, L.L.C. | Delaware | |
| RTC Gift Card LLC | Delaware | |
| Russia Building TRS LLC | Delaware | |
| School Street Associates Limited Partnership | District of Columbia | |
| SCV Partners | New Jersey | |
| SMBP LLC | Delaware | |
| SMBP REIT LLC | Delaware | |
| SMBP Venture LLC | Delaware | |
| South of Market Garage LLC | Delaware | |
| South of Market LLC | Delaware | |
| South of Market Lot 16 LLC | Delaware | |
| Springfield 6601 LLC | Delaware | |
| Springfield Metro Center II, LLC | Delaware | |
| Springfield Parcel C LLC | Delaware | |
| Square 36 Office Joint Venture | District of Columbia | |
| Square 407 Limited Partnership | District of Columbia | |
| Square 54 Office Fitness TRS LLC | Delaware | |
| Square 54 Office Owner LLC | Delaware | |
| Square 54 Residential Owner LLC | Delaware | |
| Stony Brook Associates LLC | Delaware | |
| Ten Cambridge Center Trust | Massachusetts | |
| The Atlantic Monthly Trust | Massachusetts | |
| The Double B Partnership | Massachusetts | |
| The Double B Trust | Massachusetts | |
| The Metropolitan Square Associates LLC | District of Columbia | |
| Three Cambridge Center Trust | Massachusetts | |
| Three Embarcadero Center Venture | California | |
| Times Square Tower Associates LLC | Delaware | |
| Tower Oaks Financing LLC | Delaware | |
| Tracer Lane Trust II | Massachusetts | |
| Entity Name | State of Organization | |
| Transbay Tower Holdings LLC | Delaware | |
| Transbay Tower LLC | Delaware | |
| Two Cambridge Center Trust | Massachusetts | |
| Two Freedom Square, L.L.C. | Delaware | |
| Washingtonian North Associates Limited Partnership | Maryland | |
| Wisconsin Place Office LLC | Delaware | |
| Wisconsin Place Office Manager LLC | Delaware | |
| WP Project Developer LLC | Delaware | |
| WP Trust | Massachusetts | |
| Zee Bee Trust II | Massachusetts | |
| Zee Em Trust II | Massachusetts | |