Apartment buildings are illegal to build in 73.5% of San Francisco

Max. Allowed Homes

(per 2,500 sq ft plot of land)

Red means single-family or duplexes only

Orange means triplexes or fourplexes are legal

Green means larger apartment buildings are legal

"Apartment building" is defined to be a building with 3 or more homes. It is illegal to build a building with more than 5 homes in 87% of San Francisco.

2,500 sq ft is a typical lot size in San Francisco

Assumes 2.5 apartments per 10 ft of height per 2,500 sq ft

Calculations include waiverless ADUs and ground-floor retail requirements

Many apartment buildings already exist in the red and orange areas but would be illegal to build today

You can see why new development is concentrated in the Mission, Soma, and Tenderloin neighborhoods

Data from SF gov. Code on Github.

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