- Brett and Wyckoff, Inc.22
- Brett, Wyckoff, Potter, Hamilton, Inc.31
- Brevoort Associates, Inc.13
- Briarwood Court One Corp.2
- Briarwood Holding Corp.3
- Briarwood Terrace, Inc.1
- Bricken Brothers, Inc.4
- Brickman, Richard1
- Bridge Realty Corp.2
- Brighton House, Inc.1
- Brill-Tishman Construction Co.3
- Briscope Management4
- Brittany Construction Corp.1
- Britton Development Ltd.1
- Britz, Steven Pan4
- Broad-Elm Realty Corp.1
- Broadhurst Construction Corp.1
- Broadway Bennett Corp.1
- Broadway Equities, Inc.1
- Broadway-New Street Corp.3
- Brody, S.A.2
- Broff, Irving1
- Broff, Stanley R.28
- Broka, Clifford V.2
- Bronxwood Towers, Inc.10
- Brookboro Realty Corp.1
- Brookdale Hospital Center1
- Brookfield Organization4
- Brookleff Realty Corp.1
- Brooklyn Plaza Realty Co., Inc.1
- Brown and Brenner1
- Brown, Harris, Stevens, Inc.121
- Brown, Simon and Furtsch, Inc.2
- Brown, Wheelock, Harris and Co., Inc.1
- Brown, Wheelock, Harris, Inc.1
- Brown, Wheelock, Harris, Stevens, Inc.74
- Brown, Wheelock, Harris, Vought and Co., Inc.80
- Brown, Wheelock: Vought & Co., Inc.3
- Brown. Harris, Stevems, Inc.9
- Bruce Operating Co.1
- Brucler Construtcion Corp.1
- Brunetti and Cannizzo1
- Brunetti, Louis3
- Bruno, Joseph2
- Bruton, Francis X.4
- Bryant Gardens, Inc.1
- Buccaneer, Inc.1
- Buckingham and Co.12
- Budd Management8
- Bunker Construction Corp.1
- Burlington Holding Corp.1
- Burnside Building Corp.2
- Burrow, King and Co.12
- Burton Homes, Inc.1
- Bushing Realty Corp.1
- Butler and Baldwin5
- Byrne and Bowman7
- Byrne, Bowman, and Forshay, Inc.62
- C. I. Mortgage Group1
- C. and F. Development Corp.1