First Mark Contracting Inc specializes in commercial construction from its Grantville office at 4760 Mission Gorge Place in San Diego, holding CSLB License #955151 for both General Building and General Engineering classifications in the 92120 ZIP. President Douglas Todd Mellinger leads a team whose BuildZoom score of 106 ranks in the top seven percent of California's contractors. Architectural coordination on commercial projects routes through Domeier Architects Inc in Grantville, where plan development and structural engineering keep the design-to-permit timeline within the same neighborhood. The firm's project portfolio spans commercial ground-up builds, corporate office tenant improvements, manufacturing facility construction, and technically complex renovations in occupied buildings — including OSHPD-compliant hospital and medical office construction. Education-sector work ranges from high-tech private school buildouts to USGBC-certified green classrooms and large state university facilities across the San Diego region. Healthcare construction requires HVAC systems meeting hospital-grade air-quality standards, and mechanical subcontracts on those projects run through Flow Mechanical in Allied Gardens for air-handling units, exhaust systems, and temperature-controlled environments. The Mission Gorge Place office is registered as a USDOT carrier (FMCSA #4160115) for transporting construction materials, and the company holds active SAM registration for federal government project eligibility. Mission Gorge Road connects the office to Interstate 8 westbound and State Route 125 northbound, centering the firm's reach across the county's commercial construction market.