- Brown, Guenther, Battaglia and Galvin1
- Brown, Harris, Stevens, Inc.24
- Brown, Jack9
- Brown, Wheelock, Harris, Stevens, Inc.13
- Brown, Wheelock, Harris, Vought and Co., Inc.6
- Brown, Wheelock: Vought & Co., Inc.2
- Brown. Harris, Stevems, Inc.1
- Brucler Construtcion Corp.1
- Brunetti and Cannizzo1
- Brunetti, Louis2
- Bruno, Joseph2
- Bruton, Francis X.3
- Bryant Gardens, Inc.1
- Buccaneer, Inc.1
- Buck/Cane1
- Buckingham and Co.12
- Budd Management2
- Bunker Construction Corp.1
- Burgee, John2
- Burlington Holding Corp.1
- Burnside Building Corp.1
- Burrow, King and Co.1
- Burton Homes, Inc.1
- Bushing Realty Corp.1
- Butler and Baldwin4
- Butler, Nicholas Murray, 1862-19471
- Byrne and Bowman2
- Byrne, Bowman, and Forshay, Inc.18
- C. I. Mortgage Group1
- C. and F. Development Corp.1
- C.F.L. Realty Corp.1
- C.L.J. Realty Corp.1
- C.M. Lowes Organization, Inc.1
- CLMC Corp.2
- Cabrini Terrace Co.1
- Cadillac Fairview1
- Cadplaz Sponsors, Inc.1
- Cain, Walker O., 1915-19932
- Cali, Carl B.1
- Calvin-Morris Corp.2
- Campagna Construction Corp.3
- Campagna Realty Corp.2
- Campagna, Anthony3
- Campagna, Armino A.3
- Campagna, John J.1
- Campagna, Joseph A.1
- Campagna, Michael A.3
- Campus Hall, Inc.1
- Canada House (New York) Ltd.1
- Candela, Rosario26
- Caney Realty Corp.1
- Capway Realty Corp.1
- Carey, Richard J.1
- Carlton Development Corp.1
- Carnegie Corporation of New York6
- Carnegie Council on Ethics & International Affairs1
- Carnegie Endowment for International Peace1
- Carnegie Foundation for the Advancement of Teaching1
- Carnegie Management Co.2
- Carnegie, Andrew, 1835-19194