- Lilien, H. Herbert106
- Lilien, Herbert H.1
- Limebud Realty Corp.1
- Lincoln Shore Apartments, Inc.1
- Lind-Ric Housing Co., Inc.1
- Linmar Gardens, Inc.1
- Linplace Associates8
- Lion, Henry S.1
- Lipman Associates Inc.2
- London 68 Co.4
- Long Island City Realty Co.1
- Lornoble Realty Corp.1
- Louis Carreau, Inc.1
- Louis J. Glickman, Inc.4
- Lubroth, Nathan1
- Ludlow and Peabody1
- Luna Park Housing Corp.4
- Lynn Terrace Apartments1
- Lyons, Robert T.2
- Lyras, Galvin and Anaya15
- M. Bogdanoff and Son2
- M. Rothstein and Son7
- M.D. Carlisle Co., Inc.1
- M.M. Realty Co., Inc.1
- M.N. Guzman Gutierrez Building and Construction Corp.14
- MJK Construction Corp.3
- MUHS Servicing, Inc.11
- MacArthur Construction Co.5
- Macaluso, Joseph J.1
- Mack and Davis, Inc.3
- Macklowe, Harry2
- Maggio, Nevio1
- Maggiora, Nevio4
- Magid, Maurice2
- Main Centre Holding Corp.1
- Mambrino and DiLonardo, Inc.1
- Manmil Realty Corp.1
- Mansfield Gardens, Inc.3
- Mansten Construction Corp.1
- Manwax Realty Corp.1
- Maple Avenue Real Estate Corporation1
- Mapleton Apartments, Inc.1
- Mar Fur Realty Corp.1
- Marberg and Sokoloff1
- Marble Hill Gardens, Inc1
- Marcus Brown Construction Co., Inc.2
- Marcus Brown and Sons1
- Marcus, Philip N.2
- Margon and Holder2
- Margon, Irving1
- Marion Development Corp.1
- Mark Rafalsky and Co., Inc.16
- Marmac Holding Corp.1
- Marmaros Construction Corp.3
- Martin L. Fisher Realty Corp.1
- Martin, John S.3
- Martine, Joseph1
- Marwen Construction Co., Inc.2
- Marx Realty and Improvement Co., Inc.1
- Massachusetts Mutual Life Insurance Co.2