San Francisco is a city that has always remade itself under pressure. Its Victorian streetscapes have survived seismic retrofits and glass towers, its neighborhoods defined as much by change as by its resistance to change. But no force in the city's history has reshaped the built environment as completely, or as quickly, as the technology economy. What began in the postwar sprawl of Silicon Valley migrated north and inscribed its logic onto the skyline and the lives of residents. The result of this logic is an architectural culture of considerable technical refinement and refined material palettes, yet one that remains largely indifferent to the existing population.