- Adelsohn, Edward M.1
- Adephi Homes, Inc.1
- Adler, Morris Bernard12
- Adrian Builders, Inc.1
- Advice Realty1
- Affiliated Developers, Inc.2
- Ageloff, Samuel1
- Agol Realty Corp.1
- Ajello, G.1
- Akiba Development Corp.1
- Alan H. Polkes Associates, Inc.3
- Albanese, Anthony A.1
- Albemarle Construction Corp.1
- Albemarle Gardens, Inc.2
- Alber Construction Corp.1
- Alberly Holding Corp.1
- Albert B. Ashforth, Inc.62
- Albert and Harrison, Inc.1
- Albini and Raddock2
- Albini, Louis V.6
- Alcor Realty Corp.4
- Alden Builders, Inc.1
- Alderton Co.2
- Alderton Hall, Inc.2
- Alexander Wolf and Co., Inc.58
- Alfred Kaskel and Son4
- Algin Management Co.1
- Algon Realty Corp.1
- All States Terminal Corp.3
- Allan H. Feinberg Associates1
- Alley Park Housing Corp.2
- Allied Realties1
- Allou Associates1
- Almar Construction Corp.1
- Alna Realty Corp.1
- Alpark Realty Corp.1
- Alret Realty Corp.1
- Alsam Realty Corp.1
- Alson Co.4
- Alson Trading Co.1
- Amal Realty1
- Amalgamated Meat Cutters and Butcher Workmen of North America, AFL-CIO3
- American Listings, Inc.1
- Ames Cunehan and Newman, Inc.1
- Amor Building Corp.1
- Ampir Realty Corp.1
- Anderson Avenue Park Plaza Corp.1
- Anderson and Bremer1
- Andrew Apartments Inc.1
- Angelo, G.1
- Anita Management Corp.1
- Annal Co.1
- Anru Realty Corp.1
- Ansie Realty Corp.2
- Anthony Campagna and Sons14
- Anthony Properties, Inc.1
- Antry Realty Corp.1
- Appel, Henry J.2
- Arbeit, Arnold A.10
- Arcadia Realty Corp.1