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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
121 Broadway LLC						Delaware
125 Broadway LLC						Delaware
1265 Main Office JV LLC						Delaware
1265 Main Office Subsidiary LLC						Delaware
1330 Connecticut Fitness Center TRS LLC						Delaware
17M Associates L.P.						District of Columbia
191 Spring Street Trust						Massachusetts
200 Fifth Avenue JV LLC						Delaware
200 Fifth Owner LLC						Delaware
206 Associates Limited Partnership						New Jersey
210 Associates Limited Partnership						New Jersey
211 Associates Limited Partnership						New Jersey
290 Binney LLC						Delaware
3HBXP LLC						Vermont
30 Shattuck Road LLC						Delaware
300 Binney JV LLC						Delaware
300 Binney SubREIT LLC						Delaware
347 Madison Avenue Venture, LLC						Delaware
360 PAS Holdco LLC						Delaware
360 PAS Owner LLC						Delaware
360 PAS Promote-C LP						Delaware
360 PAS Promote-G LP						Delaware
360 PAS REIT 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
601 & 651 Gateway Center LP						Delaware
601 Mass Fitness Center TRS LLC						Delaware
611 Gateway Center LP						Delaware
635 Mass Ave LLC						Delaware
681 Gateway Center LLC						Delaware
701 Gateway Center LLC						Delaware
751 Gateway Center LLC						Delaware
751 Gateway Holdings LLC						Delaware
751 Gateway Member LLC						Delaware
767 Fifth Junior Mezz LLC						Delaware

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Entity Name						State of Organization
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
880 Winter Street Cafe LLC						Delaware
890 Winter Street Cafe 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
ABXP Worldgate Investments LLC						Delaware
AJ Lot 2R Financing LLC						Delaware
AJ Lot 2R LLC						Delaware
AJ Lot 3R Financing LLC						Delaware
AJ Lot 3R LLC						Delaware
AJ Lot 8 LLC						Delaware
AM Worldgate Owner LLC						Delaware
Annapolis Junction NFM LLC						Delaware
Atlantic Wharf JV LLC						Delaware
Atlantic Wharf Subsidiary REIT LLC						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 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 200 Clarendon Cafe 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

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Entity Name						State of Organization
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 599 Lexington Avenue LLC						Delaware
BP 767 Fifth LLC						Delaware
BP 888 Boylston LLC						Delaware
BP 99 Third Avenue LLC						Delaware
BP AW Garage LLC						Delaware
BP AW Retail LLC						Delaware
BP AW Tower Office LLC						Delaware
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

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Entity Name						State of Organization
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
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/DC 767 Fifth LLC						Delaware
BP/DC Properties, Inc.						Maryland

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Entity Name						State of Organization
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
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
BP-WP Project Developer Manager LLC						Delaware
BXP 171 Dartmouth LLC						Delaware
BXP 180 CityPoint Cafe LLC						Delaware
BXP 17Fifty LLC						Delaware
BXP 200 Fifth LLC						Delaware
BXP 200 Fifth Management LLC						Delaware
BXP 2100 Penn LLC						Delaware
BXP 290 Binney Investor LLC						Delaware
BXP 300 Binney Investor LLC						Delaware
BXP 325 Main LLC						Delaware
BXP 360 Manager LLC						Delaware
BXP 360 Member LLC						Delaware
BXP 360 PAS Appointer LLC						Delaware
BXP 360 Promote GP LLC						Delaware
BXP 7750 Wisconsin Avenue LLC						Delaware
BXP Almaden Associates LP						Delaware
BXP Beach Cities LLC						Delaware
BXP California GP LLC						Delaware
BXP Carnegie Owner LLC						Delaware
BXP Colorado Center Appointer LLC						Delaware
BXP Colorado Center Manager LLC						Delaware
BXP Colorado GP LLC						Delaware
BXP Colorado LP LLC						Delaware
BXP CP South LLC						Delaware
BXP EIP Flagship III LLC						Delaware
BXP EIP Investor LLC						Delaware
BXP Folsom-Hawthorne LP						Delaware
BXP Gateway Developer LLC						Delaware
BXP Gateway Member LLC						Delaware

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Entity Name						State of Organization
BXP Harrison LLC						Delaware
BXP Investments LLC						Delaware
BXP MacArthur LLC						Delaware
BXP Madison Centre I LLC						Delaware
BXP Madison Centre II LLC						Delaware
BXP Madison Centre Manager 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 Reston Next Developer LLC						Delaware
BXP Reston Next Member LLC						Delaware
BXP Safeco Plaza Appointer LLC						Delaware
BXP Safeco Plaza Manager LLC						Delaware
BXP Safeco Plaza Member LLC						Delaware
BXP Safeco Plaza Promote GP LLC						Delaware
BXP SCP TRS LLC						Delaware
BXP Second Ave LLC						Delaware
BXP Shady Grove Lot 5 LLC						Delaware
BXP Shady Grove Lot 6 LLC						Delaware
BXP Shady Grove Lot 7 LLC						Delaware
BXP Shady Grove Lot 8 LLC						Delaware
BXP TB Development LP						Delaware
BXP Transbay Management LLC						Delaware
BXP Vault Owner LLC						Delaware
BXP VPPA One LLC						Delaware
BXP Waltham Woods LLC						Delaware
BXP West El Camino LP						Delaware
BXP Worldgate Developer LLC						Delaware
BXP Worldgate Member LLC						Delaware
BXP Zanker Road LP						Delaware
CA-Colorado Center Limited Partnership						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
Carnegie Center Associates						New Jersey

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Entity Name						State of Organization
Carnegie Center Cafes LLC						Delaware
Carnegie Center Fitness 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
Four Embarcadero Center Venture						California
Fourteen Cambridge Center Trust						Massachusetts
Gateway Center GP LLC						Delaware
Gateway Center TRS LLC						Delaware
Gateway Portfolio Holdings LLC						Delaware
Gateway Portfolio Member LLC						Delaware
Gladden Properties LLC						Delaware
Harrison 759 LP						Delaware
Hayden Office Trust						Massachusetts
Hotel Tower Developer LLC						Delaware
Hotel Tower Owner GP, LLC						Delaware
Hotel Tower Owner, LP						Delaware
IXP, LLC						Vermont
JV 347 Madison LLC						Delaware
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
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
Platform 16 Holdings LP						Delaware
Platform 16 Sub LLC						Delaware
Platform 16 LLC						Delaware
Podium Developer LLC						Delaware

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Entity Name						State of Organization
Podium Owner GP, LLC						Delaware
Podium Owner, LP						Delaware
PR II/BXP Reston Gateway LLC						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 D1, LLC						Delaware
Reston Gateway Condo D2, LLC						Delaware
Reston Gateway Condo D3, 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
Rosecrans-Sepulveda Partners 4, LLC						Delaware
RTC Gift Card LLC						Delaware
Russia Building TRS LLC						Delaware
Safeco Plaza LLC						Delaware
Safeco Plaza Promote-G LP						Delaware
Safeco Plaza Promote-K LP						Delaware
Safeco Plaza REIT 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
Sub REIT 347 Madison LLC						Delaware
Ten Cambridge Center Trust						Massachusetts
The Atlantic Monthly Trust						Massachusetts
The Double B Trust						Massachusetts
Three Cambridge Center Trust						Massachusetts

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Entity Name						State of Organization
Three Embarcadero Center Venture						California
Times Square Tower Associates LLC						Delaware
Tower Oaks Financing LLC						Delaware
Tracer Lane Trust II						Massachusetts
Transbay Tower Holdings LP						Delaware
Transbay Tower LP						Delaware
TST Amenities TRS LLC						Delaware
Two Cambridge Center Trust						Massachusetts
Two Freedom Square, L.L.C.						Delaware
View Boston Attraction LLC						Delaware
View Boston Attraction Owner LLC						Delaware
View Boston Icon I LLC						Delaware
View Boston Icon II LLC						Delaware
View Boston Improvements Lender LLC						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