- AC Martin Partners
- Advantec
- AECOM
- Brookfield Development
- Brookhollow Inns of America
- Burns and McDonnell
- Bureau Veritas
- California State University, Long Beach
- California State University, Pomona
- California State University, San Marcos
- Caltrans District 8
- Cass, Sowatsky, Chapman & Associates
- CDM
- Chambers Group
- Choy and Associates
- City of Anaheim
- City of Beaumont
- City of Buena Park
- City of Brea
- City of Carson
- City of Cerritos
- City of Commerce
- City of Dana Point
- City of Del Mar
- City of Garden Grove
- City of Irvine
- City of Laguna Niguel
- City of Lake Forest
- City of Long Beach
- City of Los Angeles
- City of Mission Viejo
- City of Montebello
- City of Newport Beach
- City of Oceanside
- City of Ontario
- City of Palm Springs
- City of Riverside
- City of San Diego
- City of San Fernando
- City of Santa Ana
- City of Santa Barbara
- City of Santa Clarita
- City of Santa Fe Springs
- City of Santee
- City of Solana Beach
- City of South Pasadena
- City of Vernon
- City of Yorba Linda
- Controlled Environments Construction
- County of Los Angeles
- County of Orange
- County of Riverside
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- County of Santa Barbara
- David Denton Architects
- Del Mar Union School District
- Desert Sands Unified School District
- Disney Imagineering
- DMJM+Harris
- Fluor Daniel
- GB Architects
- GGK Works
- Henry Woo Architects
- HNTB
- HOK
- Housing Authority of the City of Los Angeles
- JL Patterson
- KAL Architects
- KFM Engineers
- Kimley Horn Engineers
- Los Angeles County Metropolitan Transportation Commission
- Laguna Pacific Company
- LIN Consulting
- Long Beach Unified School District
- Los Angeles Unified School District
- MBT
- Moffatt and Nichol
- Mountain Recreation Conservation Authority
- MVE & Partners
- Naval Facilities Engineering Command Southwest Division
- Orange County Transportation Authority
- Orange County Water District
- Parsons Brinckeroff
- Perkins and Will
- PSOMAS
- Riverside County Transportation Commission
- RJC Architects
- Rossetti Architects
- Southern California Regional Rail Authority
- State of California
- Stronghold Engineering
- STV
- Terra Costa Consulting
- TetraTech
- Trittipo and Associates
- Tustin Unified School District
- University of California at Irvine
- University of California at Riverside
- URS Corporation
- US Army Corps of Engineers, Los Angeles District
- Veterans Administration
- Westfield Development
- Westgroup Designs
- WLC Architects
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