- Blaufeux, Maxfield5
- Blitman Construction Corp.2
- Blum, Walter E.1
- Blumenson-Sussman Corp.1
- Boak and Paris13
- Boak and Raad38
- Boardwalk Sales Corp.1
- Bogardus Associates, Inc.1
- Bonafide Estates, Inc.1
- Bonford Building Corp.2
- Boomer, Lucius1
- Booth Building Corp.1
- Booth Realty Corp.1
- Borchard Affiliates, Inc.2
- Borchard Management Corp.7
- Borne-Chisner Development Corp.2
- Boropark Gardens, Inc.1
- Boston ConstructionCorp.1
- Bottomley, William Lawrence2
- Boulevard Construction Corp.1
- Bowman, A.M.1
- Bowmark Realty Corp.1
- Boyd E. Wilson and Co., Inc.1
- Bradford House, Inc.1
- Bragoni, Hugh1
- Braunstein, Benjamin38
- Braunstein-Neisloss1
- Brause and Brause1
- Brawman, Julius1
- Brecher, Morris1
- Breed, Fuller, and Dick2
- Brennan Realty1
- Brentwood Hall, Inc.1
- Bres Realty Co.3
- Brett and Wyckoff, Inc.6
- Brett, Wyckoff, Potter, Hamilton, Inc.16
- Brevoort Associates, Inc.5
- Briarwood Court One Corp.1
- Briarwood Terrace, Inc.1
- Bricken Brothers, Inc.3
- Brickman, Richard1
- Bridge Realty Corp.2
- Brighton House, Inc.1
- Briscope Management1
- Brittany Construction Corp.1
- Britton Development Ltd.1
- Britz, Steven Pan1
- Broad-Elm Realty Corp.1
- Broadhurst Construction Corp.1
- Broadway Bennett Corp.1
- Broadway Equities, Inc.1
- Broadway-New Street Corp.1
- Broff, Stanley R.4
- Bronxwood Towers, Inc.1
- Brookdale Hospital Center1
- Brookfield Organization2
- Brookleff Realty Corp.1
- Brooklyn Plaza Realty Co., Inc.1
- Brown and Brenner1
- Brown and Guenther14