WSP USA in downtown San Diego occupies the Wells Fargo Bank Building on B Street, the local branch of a global engineering consultancy whose U.S. lineage traces to Parsons Brinckerhoff's 1885 founding in New York City. The San Diego office focuses on transportation infrastructure, water systems, and environmental consulting, disciplines that overlap with the multidisciplinary planning at AECOM San Diego on projects requiring coordinated civil and structural scope. Engineering News-Record ranked WSP's parent company seventh among the Top 500 Design Firms, and the firm's U.S. division fields roughly 31,500 employees across 500 offices in 39 countries. City of San Diego contracts route through the Engineering and Capital Projects Department, where WSP's design professionals deliver LEED Silver–compliant facility plans under Council Policy 900-14, an urban sustainability mandate that also shapes site work by landscape and planning firms like KTU & A Planning and Landscape Architecture. The firm's highest-complexity local engagements involve full bridge, transit corridor, and municipal utility replacement programs requiring multi-year phased construction management.