- Kraushar, Henry L.1
- Kreymborg, Charles32
- Krumholz, Philip1
- L and E Construction Corp.1
- L.J. Phillips and Co.3
- L.J. Phillips-Wood, Dolson Co., Inc.32
- L.V. Hoffman and Co.3
- La Vinci Apartments Co.1
- Ladley Realty Corp.1
- Lama, Proskauer and Prober25
- Landau-Banker Realty Corp.2
- Landmark Team8
- Landon Holding Corp.1
- Lane Gardens Inc.1
- Lane Realty Co.2
- Lanzarone, I.H.2
- Lapidus, Morris4
- Larco Building Corp.1
- Lark Equities1
- Larkin, Edward L.1
- Larkin, John A.1
- Lasette, Frank B.3
- Lawn Place Realty Corp.1
- Lazarus, Frank L.1
- Le Havre1
- Lebar Realty Corp.1
- Leff, Ralph1
- Lefrak Organization109
- Lefrak, Harry13
- Lehar Building Corp.1
- Leibowitz Construction Co., Inc.1
- Leland Development Corp.3
- Lemer Equities, Inc.1
- Len Operating Corp.2
- Lenmann Associates, Inc.1
- Lenrand Realty Corp.1
- Lenris Realty Corp.2
- Leon Building Corp.1
- Leona, Inc.1
- Leonard J. Beck, Inc.2
- Leonard Schultz and Associates4
- Lescaze, William16
- Leseen Realty Corp.1
- Lester, Eugene R.13
- Levy, Edgar A.1
- Levy, Emilio1
- Levy, Leon2
- Levy, Lionel6
- Levy, Louis1
- Levy, Sampson1
- Lewis, Albert W.3
- Lewis, Alfred1
- Lex-56th Corp.4
- Lexington Apartments, Inc.1
- Lexington Estates, Inc.1
- Lexington Holding Corp.1
- Liebman, Harold M.1
- Liebman, Liebman and Associates10
- Life Realty Corp.33
- Lilien, Clarence66