| Business | Phone |
| Metropolitan Building Consultant 114 Oxford St, Cambridge 2140 | (978) 562-5506 |
| Caron Building Corp 25 1st St, Cambridge 2141 | (617) 621-3442 |
| Commonwealth Building Inc 198 Alewife Brook Pkwy, Cambridge 2138 | (617) 547-0104 |
| Designbuild 4u Cambridge 2138 | (617) 497-1000 |