- Ismac Realty Corp.1
- Ithaca Building Corp.1
- Ithaca Street Apartments Co.1
- J. Friedman Construction Co., Inc.1
- J. Marmaros Construction Corp.1
- J.C. Building Corp.1
- J.D.B. Realty Corp.1
- J.G. Haft and Co., Inc.3
- J.I. Sopher and Co., Inc.5
- J.P. Lieberman and Son, Inc.2
- JC Organization1
- Jack Hegarty Co., Inc.1
- Jackson Construction Corp.1
- Jackson Fillmore Corp.1
- Jackson Heights-Mount Vernon Corp.1
- Jackson House Corp.1
- Jackson Management Corp.1
- Jacksonian Apartments, Inc.1
- Jacob D. Berg and Sons1
- Jamaica Ave. and 138th Place Corp.1
- James Felt and Co., Inc.1
- Janent Holding Corp.1
- Jardwo Construction Corp.1
- Jasi Realty Corp.1
- Jewel Estates, Inc.2
- Joedbur Realty Corp.2
- John E. Warner and Sons, Inc.2
- John L. Hennessy Co.1
- Jonat Realty Corp.1
- Julius S. Brauman and Son1
- Juster, M.W.1
- K and H Associates1
- Kalb Construction Corp.1
- Kalikow Construction Corp.7
- Kalikow Management1
- Kalikow Properties, Inc.1
- Kalt, Max1
- Kanam Building Corp.1
- Kapson Building Corp.1
- Kaskel, Alfred L.7
- Kaskel, Arthur L.5
- Kavner Holding Corp.1
- Kaybar Apartments, Inc.1
- Kaye Realty Co.1
- Kaye and Sons, Inc1
- Kaye and Sons, Inc.1
- Kebel Associates1
- Kellner, Leonard1
- Kellner, Murray1
- Kellner, Sam J.2
- Kelmar Holding Corp.9
- Kensington Hall, Inc.1
- Kensinton Arms, Inc.1
- Kent Victoria, Inc.1
- Kern Realty Co.4
- Kershaw and Seeman Associates2
- Kershaw-Seeman-Grundfest Associates1
- Kessler-Hess1
- Kew Drive Corp.1
- Kew Forest Apartments, Inc.1