One Maritime Plaza Office Tower Seismic Strengthening
San Francisco, CA

Est. Construction Cost: $8 Million (through Phase 1)
Owner: Equity Office Properties

Seismic retrofit of a landmark 28-story steel-framed office tower with exterior “X” braces that expresses structure as architecture. The tower was strengthened to achieve collapse prevention under ground shaking from the Maximum Considered Earthquake in accordance with FEMA 273. The retrofit consists of the addition of braces to the bottom story, new horizontal box beams at brace intersections to the corner columns, strengthening of selected “X” brace connections, and other miscellaneous strengthening to be constructed in later phases.