- Kaskel, Arthur L.2
- Kaswick Reaty Corp.1
- Katz, S. Walker1
- Kaufman, William5
- Kavy and Kavovitt106
- Kavy, Morris1
- Kaybar Apartments, Inc.1
- Kaye Realty Co.1
- Kaye-Abramson Realty and Construction Co.1
- Kehaya Realty Corp.2
- Keith House, Inc.1
- Kelbert Realty Corp.1
- Kellner and Anchell1
- Kellner, Leon A.1
- Kellner, Louis1
- Kellner, Murray1
- Kellner, Sam J.1
- Kelly and Gruzen4
- Kelmar Holding Corp.8
- Kenmore Realty Co., Inc.1
- Kenneth McCrary Associates, Inc.1
- Kent Victoria, Inc.1
- Kent, David1
- Keoppel and Keoppel7
- Kern Realty Co.3
- Kershaw and Seeman Associates2
- Kershaw-Seeman-Grundfest Associates1
- Kessler Wohl Associates2
- Kew Gardens Hills Housing Associates, Inc.1
- Kew Leasing Corp.1
- Kew Queen Corp.1
- Kibel Co.6
- Kibel, Henry9
- Kimmel Brothers Realty and Construction Co.2
- Kingcrest Construction Corp.1
- Kings College Gardens, Inc.1
- Kingsdale Building Corp.1
- Kingsland Builders, Inc.1
- Kingston Development Corp.1
- Kingsway Developments, Inc.1
- Kingsway Terrace Corp.1
- Kinsor Management Co.1
- Kirchman, Milton F.2
- Kitzler and Nurich1
- Kleban and Leader2
- Klein, Frederick7
- Klein, Murray2
- Klein, Stanley H.1
- Koester, Charles Lee1
- Kokkins and Lyras7
- Kokkins, John M.17
- Kolow Construction Corp.1
- Kornblath, Hanle, and Liebman2
- Kornblath, Leo14
- Koso, Edward5
- Kraham Realty Co., Inc.41
- Kramer, Louis1
- Kraslow, George1
- Kratter Corp.1
- Kraus, David6