EXHIBIT 21.1

Subsidiaries of Boston Properties, Inc. As of February 18, 2004

101 Carnegie Center Associates

17M Associates

206 Associates Limited Partnership

210 Associates Limited Partnership

211 Associates Limited Partnership

30 Shattuck Road LLC

500 Series, LLC

90 Church Street Limited Partnership

Big Apple Associates Limited Partnership

Boston Properties Limited Partnership

Boston Properties LLC

Boston Properties Management, Inc.

Boston Properties TRS, Inc.

BP 111 Huntington Ave LLC

BP 1330 Connecticut Avenue LLC

BP 1333 New Hampshire Avenue LLC

BP 140 Kendrick Street LLC

BP 140 Kendrick Street Property LLC

BP 20 F Street Limited Partnership

BP 201 Spring Street LLC

BP 280 Park Avenue LLC

BP 280 Park Avenue Manager Corp.

BP 280 Park Avenue Mezzanine LLC

BP 399 Park Avenue LLC

BP 45th Associates LLC

BP 8th Avenue Associates LLC

BP Almaden Associates LLC

BP Belvidere LLC

BP Boylston Residential LLC

BP Crane Meadow, L.L.C.

BP EC West LLC

BP EC1 Holdings LLC

BP EC2 Holdings LLC

BP EC3 Holdings LLC

BP EC4 Holdings LLC

BP Fourth Avenue, L.L.C.

BP Gateway Center LLC

BP Hotel LLC

BP II LLC

BP III LLC

BP Lending LLC

BP Lex LLC

BP Management, L.P.

BP OFR LLC

BP Prucenter Acquisition LLC

BP Prucenter Development LLC

BP Realty New Jersey LLC

BP Reston Eastgate LLC

BP Supermarket LLC

BP Weston Quarry LLC

BP/CG Member I LLC

BP/CG Member II LLC

BP/CG Member III LLC

BP/CGCenter Acquisition Co. LLC

BP/CGCenter I LLC

BP/CGCenter II LLC

BP/CGCenter MM LLC

BP/CGCenter MM2 LLC

BP/CRF 265 Franklin Street Holdings LLC

BP/CRF 265 Franklin Street LLC

BP/CRF 265 Franklin Street Manager Corp.

BP/CRF 265 Franklin Street Mezzanine LLC

BP/CRF 901 New York Avenue LLC

BP/DC Properties, Inc.

BP/DC REIT LLC

Cambridge Center West Associates Limited Partnership

Cambridge Group LLC

Carnegie 214 Associates Limited Partnership

Carnegie 504 Associates

Carnegie 506 Associates

Carnegie 508 Associates

Carnegie 510 Associates, L.L.C.

Carnegie Center Associates

CRF Met Square LLC

Decoverly Five Limited Partnership

Decoverly Four Limited Partnership

Decoverly Seven Limited Partnership

Decoverly Six Limited Partnership

Decoverly Two Limited Partnership

Democracy Associates Limited Partnership

Democracy Financing, LLC

Discovery Square, L.L.C.

East Pratt Street Associates Limited Partnership

Embarcadero Center Associates

Embarcadero Center, Inc.

Four Embarcadero Center Venture

Gateway Center LLC

HarborPlace Boston LLC

IXP, Inc.

Jones Road Development Associates LLC

Lexreal Associates Limited Partnership

LKE BP Fourth Avenue Limited Partnership

Market Square North Associates Limited Partnership

MGA Virginia 85-1 Limited Partnership

MGA Virginia 86-1 Limited Partnership

MGA Virginia 86-2 Limited Partnership

Montgomery Village Avenue Joint Venture Limited Partnership

New Dominion Technology Corp.

New Dominion Technology Park II LLC

New Dominion Technology Park LLC

New Jersey & H Street LLC

No. 1 Times Square Development LLC

No. 5 Times Square Development LLC

Ocean View Development Company Limited Partnership

One Embarcadero Center Venture

One Freedom Square, L.L.C.

Pratt Street Financing, LLC

Princeton 202 Associates Limited Partnership

Princeton Childcare Associates Limited Partnership

Reston Corporate Center Limited Partnership

Reston Town Center Office Park Phase One Limited Partnership

Reston VA 939, LLC

School Street Associates Limited Partnership

SCV Partners

Southwest Market Limited Partnership

Square 36 Office Joint Venture

Square 407 Limited Partnership

Stony Brook Associates LLC

The Double B Partnership

The Metropolitan Square Associates LLC

Three Embarcadero Center Venture

Tower Oaks Financing LLC

Two Freedom Square, L.L.C.

Washingtonian North Associates Limited Partnership