San Francisco, California
Program: A 12-story, 332,000-square-foot speculative office building set into San Bruno Mountain alongside the highway. The project includes a performing arts center and space for a health club and retail on the ground floor, a childcare center and outdoor play area on the second level, and a 1,000-car garage. The structure was designed as part of a pair; the second tower has been delayed due to market conditions.
Design concept and solution: Conceiving Centennial Tower as a sculptural object set into the base of the mountain, the architects wanted the building to both play off the topography and contribute to its rehabilitation. They aimed to make the structure a beacon for travelers heading into south San Francisco while also keeping its bulk in check. The project takes up only 8 of 20 acres on the site, which was damaged during construction of the highway; the remainder is set aside for a conservation plan, which includes a replanting program to restore the mountain's edge. The architects designed a steel tower with a rounded, veil-like curtain wall whose curves echo the shape of the terrain and the arcs of the highway's ramps. (The garage is embedded in the valley behind the tower to help conceal some of the project's mass.) For motorists passing by, the building's shape shifts and its color changes. Differences in light affect the colors of the facade, which vary from silvers to blues to warm hues depending on the time of day. The architects used the largest amount of clear glass on the east side of the building, gradually replacing it with spandrels toward the southern facade. Inside, they used finishes inspired by the tower's surroundings, from limestone walls and floors in the lobby to dark walnut in the elevator lobbies and cabs.
Skidmore, Owings & Merrill LLP
1 Front Street
San Francisco, CA 94111
Completion Date: June 2009
Total construction cost: $100 million
Personnel in architect's firm who should receive special credit:
Design Director: Michael Duncan, AIA
Design Partner: Craig Hartman, FAIA
Technical Director: C. Keith Boswell, AIA
Project Manager: Steven Sobel, AIA
Senior Technical Coordinator: David Frey, AIA, NCARB, LEED® AP
Design Architect: Decker Flynn, R.A.
Design Architect: Alex Tsang
Project Architect: Diwakar Chintala
Architect: Ina Wong
Architect of record
Associate Director: Tamara Dinsmore, AIA, IIDA, LEED AP
Associate: Chanda Capelli, IIDA, NCIDQ
Associate: Virgil Skipton, AIA, IIDA
Civil: Brian Kangas Foulk Engineers (BKF). Project Lead: Brian Scott, PE
CAD system, project management, or other software used: AutoCAD, Version 2008