| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | 3C Capital Centro Comercial Development S.A. | developer | 0 |
| 2 | A4 Arquitectos Asociados S.L. | architect | 2 |
| 3 | Abalos & Herreros Arquitectos | architect | 3 |
| 4 | Abalos+Sentkiewicz | architect | 1 |
| 5 | Abarrategui | architect | 2 |
| 6 | A-Cero | architect | 1 |
| 7 | Aeropuertos Españoles y Navegación Aérea | client | 1 |
| 8 | Agofer | real estate agent | 2 |
| 9 | Aguinaga y Asociados Arquitectos | architect | 4 |
| 10 | Aguirre Newman | property management | 9 |
| 11 | Alas Casariego Arquitectos | architect | 1 |
| 12 | Alberto Martín de Lucio | architect | 1 |
| 13 | Aldesa Construcciones | construction company | 2 |
| 14 | Alkadir | developer | 0 |
| 15 | Allende Arquitectos | architect | 2 |
| 16 | Angel Hernández Espada | architect | 1 |
| 17 | Antonio Lamela Martinez | architect | 7 |
| 18 | Apex Inmobiliaria S.A. | real estate agent | 2 |
| 19 | Arcona Ibérica | developer | 0 |
| 20 | Arenas y Asociados, Ingeniería de diseño | engineering association | 1 |