| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Banesto S.A. | Financing | 3 |
| 2 | Bankinter | Owner | 1 |
| 3 | Beirak y Ulanosky Arquitectos | Architect | 1 |
| 4 | BELMONSA | Developer | 1 |
| 5 | Bigeco Grupo Inmobiliario | Developer | 1 |
| 6 | Bolonia Real State | Real estate agent | 2 |
| 7 | Bouygues Inmobiliaria S.A. | Developer | 4 |
| 8 | Bovis Lend Lease | Property management | 2 |
| 9 | Broadway Malyan Limited | Architect | 0 |
| 10 | BSA Consult | Architect | 3 |