- Ackman Brothers1
- Adler, Morris Bernard7
- Adrian Builders, Inc.1
- Affiliated Developers, Inc.2
- Ajello, G.1
- Akiba Development Corp.1
- Alan H. Polkes Associates, Inc.2
- Albemarle Gardens, Inc.1
- Albert B. Ashforth, Inc.36
- Albert and Harrison, Inc.1
- Alcor Realty Corp.2
- Alderton Co.2
- Alderton Hall, Inc.2
- Alexander Wolf and Co., Inc.49
- All States Terminal Corp.3
- Allied Realties1
- Almar Construction Corp.1
- Alna Realty Corp.1
- Alpark Realty Corp.1
- Alsam Realty Corp.1
- Alson Co.4
- Alson Trading Co.1
- Amor Building Corp.1
- Ampir Realty Corp.1
- Annal Co.1
- Anru Realty Corp.1
- Ansie Realty Corp.1
- Anthony Campagna and Sons12
- Anthony Properties, Inc.1
- Appel, Henry J.2
- Arbeit, Arnold A.9
- Architects Design Group3
- Architects and Engineers Affiliates1
- Ardale Building Corp.1
- Ardlan Construction Co., Inc.1
- Armory Estates, Ltd.5
- Armstrong, Lorenzo D.1
- Arnley Construction Co., Inc.1
- Arno Realty Corp.1
- Arnold M. Goldman and Co., Inc.12
- Artcourt Realty Co.1
- Arthold Realty Co.1
- Arthur Hardgrove Co.12
- Artpaul Realty Co., Ltd.9
- Artsis, Jerome M.2
- Arwin Construction Corp.1
- Asher Dann and Sons3
- Asher Dann and Sons, Inc.3
- Ashley Apartments, Inc.2
- Ashwood Realty Corp.1
- Astor, Vincent9
- Atlantic Towers, Inc.3
- Atlas and Son1
- Atlas, Sol G.8
- Austin Gardens Realty Corp.1
- Austin Management Corp.1
- Avecrest Realty Co., Inc.1
- Avenue Associates6
- Avlon, John3
- Axelrod-Walker Corp.2