- Chain Building Corp.1
- Charles F. Noyes Co., Inc.5
- Charles H. Greenthal & Co.3
- Charles H. Greenthal & Co., Inc.2
- Charles H. Greenthal and Co., Inc.145
- Charles Management Co.10
- Chatham-Phenix Building1
- Chattilon, E.H.4
- Chelsea Associates1
- Chelsea Land Corp.1
- Chelsea Management Corp.15
- Chester Lane, Inc.2
- Churchill Land Corp.1
- Chutick, J.2
- Ciampa Organization1
- Ciampi, C.1
- Ciampson Realty Corp.1
- Ciluzzi Construction Corp.1
- Citadel Hall, Inc.1
- Citizens Savings Bank1
- City Builders, Inc.1
- City Center Organization8
- City Investing Co.5
- Clarciam Realty Corp.1
- Clarence R. Knickman, inc.7
- Claridge Realty Corp.2
- Clark T. Chambers, Inc.1
- Clark-Robinson Corp.1
- Clarkson Development Corp.2
- Clayton Apartments, Inc.12
- Clement E. Merowit and Co.1
- Clifford Apartments, Inc.5
- Clifton Manor Apartments, Inc.2
- Climcheck, S.1
- Clinton Construction Corp.1
- Clinton Housing Association1
- Clinton Terraces, Inc.1
- Clover Building Corp.1
- Cloverton Corp.3
- Clyde Management Corp.6
- Coates Realty Corp.4
- Code Holding Corp.1
- Cohen Brothers Realty16
- Cohen Brothers Realty and Construction Corp.18
- Cohen, Jacob2
- Cohen, Rabbi Eugene1
- Cohen, Samuel3
- Coldwell Banker1
- Cole Brothers2
- Colemont Realty Corp.1
- Collins, Tuttle and Co.25
- Colonial Apartments, Inc.1
- Colonial Realty Co., Inc.1
- Colonial Towers, Inc.2
- Colony Estates, Inc.2
- Colony Gardens, Inc.1
- Colton Realty Corp.1
- Columbia University College of Physicians and Surgeons1
- Columbia-Clark Corp.7
- Commercial Builders, Inc.1