46% of San Francisco's homes sit in rent-controlled buildings, and in 5 neighborhoods they leave through evictions and buyouts at a rate that new permits do not begin to replace.
Rent control by neighborhood: the covered stock counted building by building from the assessor's roll, and every notice, buyout, permit and sale measured against it.
San Francisco's rent ordinance covers multi-unit buildings completed before June 1979, and the assessor publishes every parcel's completion year, units and class each year, so the covered stock can be counted rather than estimated. This project counts it for each of the Civic Atlas's 117 neighborhoods, then measures the Rent Board's eviction notices (deduplicated to filings, because a tenth are re-served), buyout agreements and petitions against that stock; net units on building permits against all residential units; and the assessor's reassessments at sale as the one price signal a Prop 13 roll carries. A two-by-two of exits against arrivals was fixed before the numbers were seen, with absolute thresholds, a floor on eligible units, Poisson intervals beside every rate and a written rule for what no finding looks like. The moratorium years are excluded, the roll's one corrupted class is corrected per parcel, and the buildings that file thirty notices in a day are named rather than averaged.