- Charles Broadway House1
- Charles Broadway Rouss1
- Charles F. Adams1
- 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 H. Howell & Co.1
- Charles H. North & Co.1
- Charles King1
- Charles M. Clapp & Co.1
- Charles Management Co.8
- Charles Mayer & Co.1
- Charles Vagt & Co.2
- Chas Israel & Bros.1
- Chas. F. Baker & Co.2
- Chas. P. Willard & Co.1
- Chas. W. Freeland & Co.1
- Chase & Sanborn1
- Chattilon, E.H.3
- Chelsea Associates1
- Chelsea Management Corp.11
- Cherouny & Kienle, Printers1
- Chester Lane, Inc.1
- Chicago Bakery Company1
- Chicago Label Box Company1
- Chicago Title & Trust Company1
- Ciampa Organization1
- Ciampi, C.1
- Ciampson Realty Corp.1
- Cincinnati Tin & Japan Company1
- Cincinnati, Hamilton, and Dayton Railroad Company1
- Citadel Hall, Inc.1
- Citizen's National Bank2
- Citizens National Bank of New York1
- City Builders, Inc.1
- City Center Organization7
- City Hotel1
- City Investing Co.4
- City Mills Company1
- Clarciam Realty Corp.1
- Clarence Lilien and Associates1
- Clarence R. Knickman, inc.6
- Claridge Realty Corp.1
- Clark, Adams & Clark1
- Clark, Austin & Smith1
- Clarke & Jones1
- Clarkson Development Corp.2
- Clawson, Harry M.8
- Clayton Apartments, Inc.8
- Clement E. Merowit and Co.1
- Clifford Apartments, Inc.5
- Clifton Manor Apartments, Inc.1
- Climcheck, S.1
- Clinton Hotel1
- Clinton Housing Association1
- Cloverton Corp.2
- Coates Realty Corp.4
- Code Holding Corp.1
- Cohen Brothers Realty10