| Business | Phone |
| Civil Land Engineering 11213 Downey Ave, Downey 90241 | (562) 622-6927 |
| Millot Group 9102 Firestone Blvd, Downey 90241 | (562) 923-0023 |
| Villarreul & Assoc 7340 Florence Ave, Downey 90240 | (562) 928-6006 |
| L P Leavitt & Assoc 9724 Blandwood Rd, Downey 90240 | (562) 670-0941 |