- J.D. Robilotto Co., Inc.1
- J.E. Watson, Inc.1
- J.F. Cahill and Co., Inc.2
- J.G. Haft and Co., Inc.12
- J.H. Taylor Construction Co., Inc.3
- J.H. Taylor Management Co., Inc.7
- J.I. Sopher and Co., Inc.28
- J.P. Lieberman and Son, Inc.2
- JC Organization1
- Jacfred Apartments, Inc.1
- Jack Resnick and Son7
- Jackson Management Corp.4
- Jacobs, Harry Allan3
- Jacoby Construction Co.1
- Jahil Realty Corp.1
- James Charles Stewart, Inc.26
- James Felt and Co., Inc.1
- James Realty Co.1
- James Stewart and Co., Inc.1
- Janos-Langer2
- Jardine Murdock and Wright8
- Jarmul, Seymour82
- Jasi Realty Corp.1
- Jay R. Braus Co.4
- Jedsor Realty Corp.1
- Jefflan Realty, Inc.1
- Jerelyn Realty Corp.1
- Jerome Building Corp.1
- Jerome Equities, Inc.1
- Jo-Ann Realty Corp.1
- Joan Building Corp.1
- Jochas Corp.1
- Johanson, Henry W.1
- John Avlon, Inc.13
- John H. Carpenter Jr., Inc.5
- John J. Reynolds Management Co., Inc.2
- Johnson, Philip4
- Jonas Construction Co., Inc.1
- Jonas Equities, Inc.1
- Jonat Co.17
- Jonat Realty Corp.1
- Jonathan Woodner Co.9
- Jonic Properties1
- Joseph H. Lopin and Co.1
- Joseph H. Nassoit Management Corp.15
- Joseph H. Nassoit, Inc.10
- Joseph P. Blitz, Inc.1
- Joseph, Seymour R.9
- Julien J. Studley, Inc.20
- Julius Tishman and Sons, Inc.1
- Juster, M.W.1
- K. Equities Inc.1
- KBS Construction15
- Kahn and Jacobs9
- Kalb Construction Corp.1
- Kalikow Construction Corp.15
- Kalikow Realty and Construction Corp.5
- Kamenka, Hippolyte34
- Kanam Building Corp.1
- Kaskel, Alfred L.8