- Brown, Wheelock: Vought & Co., Inc.1
- Brown. Harris, Stevems, Inc.8
- Bruce Operating Co.1
- Brunetti, Louis1
- Bruton, Francis X.1
- Budd Management6
- Burgee, John4
- Burnside Building Corp.1
- Burrow, King and Co.8
- Butler and Baldwin1
- Byrne and Bowman5
- Byrne, Bowman, and Forshay, Inc.44
- CH Construction Corp.1
- CLMC Corp.1
- Cadillac Fairview2
- Cajorco Realty Corp.1
- Calvin-Morris Corp.12
- Cambridge Realty Corp.1
- Campagna Construction Corp.13
- Campagna, Anthony8
- Campagna, Armino A.2
- Campagna, John J.6
- Campagna, Joseph A.2
- Campagna, Michael A.2
- Candee Realties1
- Candela, Rosario68
- Canin1
- Capri Apartments, Inc.1
- Carey, Richard J.1
- Carlton Estate Inc.1
- Carlyle Construction Corp.1
- Carner, Ingram S.5
- Carner, Jack2
- Carol Enterprises, Inc.1
- Carol Management Corp.46
- Carol Sales Corp.1
- Carpenter, J.E.R.9
- Carreau, Lewis2
- Carson and Lundin2
- Casale and Nowell11
- Casale, James E.2
- Caton Apartments, Inc.3
- Caughey and Evans3
- Caughey, A. Rollin19
- Caughey, Rollin A.12
- Cauldwell-Wingate Co., Inc.6
- Ced-Hill Construction Corp.3
- Centre City Org.6
- Charles F. Noyes Co., Inc.1
- Charles H. Greenthal & Co.3
- Charles H. Greenthal & Co., Inc.1
- Charles H. Greenthal and Co., Inc.76
- Charles Management Co.8
- Chattilon, E.H.3
- Chelsea Associates1
- Chelsea Management Corp.11
- Chester Lane, Inc.1
- Ciampa Organization1
- Ciampi, C.1
- Ciampson Realty Corp.1