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Rockridge Geotechnical

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Alexan Webster

2330 Webster Street, Oakland, CA

Located in downtown Oakland, the Alexan Webster is a mixed-use development, providing 235 apartments on a former surface parking lot. The development provides 15,000 square feet of retail space along Valdez Street.

Site Square Footage: 1.03 acres

Date Completed: 2019

Construction Cost:  ~$135 million

Client: Trammell Crow Residential

Architect: KTGY Architecture + Planning

Structural Engineer: FBA Structural Engineers and Peoples Associates Structural Engineers

Civil Engineer: BKF Engineers

General Contractor: RJS & Associates

Along with the new 235 units of housing, the retail space on Valdez will work in conjunction with a future development across the street. These two developments will create the Valdez retail corridor. The development includes a below-grade level of parking for the City of Oakland that is separated from the parking available to residents. 

During the geotechnical investigation and historical data review, Rockridge Geotechnical (RG) identified that much of the site was covered by fill with an area up to about 15 feet thick where a former building with a basement was located. Because the proposed basement level was near the historic high groundwater level, a mat foundation was recommended to simplify the detailing of waterproofing and to provide suitable total and differential settlement for both static and seismic conditions. The excavation was temporarily supported by soldier piles with tiebacks, and the adjacent building to the east was underpinned with hand-excavated piers.

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