As the demand for urban housing increases, the untapped air space above existing buildings is being explored to increase the value and rental income of individual properties. To put it more simply, ...

A developer has filed plans to top a commercial building in San Francisco’s Chinatown with a two-story addition of six apartments. Xie Associates, an architectural firm led by Bill Guan based in ...

Building on top of another building is nobody’s first choice. Issues of structural capacity, construction logistics, approvals for extra height, and aesthetic and programmatic relationships make it ...