California's cooperative stock is small, and tenancy in common filled the gap.

Few cooperatives were built here, and the largest sits in one retirement community.

California's subdivision regulator states that few undivided interest, community apartment, stock cooperative and limited equity housing cooperative projects have been developed in the state. Across the public report applications the department processed from 1993 to 2012, planned developments and condominiums together accounted for nine in ten. Stock cooperatives, community apartments, limited equity cooperatives and undivided interest projects fell together under one percent of that total.

One place the form does appear is Laguna Woods Village in Orange County, an age restricted community governed by three mutual benefit housing corporations. United Laguna Woods Mutual is the stock cooperative among them, and a sister mutual in the same community is organized as a condominium. Construction began in 1963 and the first residents moved in during 1964, decades before the surrounding land incorporated as its own city in 1999.

Tenancy in common grew into a form of its own in San Francisco because it escapes the Subdivision Map Act altogether. Forming one requires no recorded map and no approval from a local agency, both of which a condominium or a stock cooperative does require. San Francisco runs an annual cap on condominium conversions, and by 2013 roughly 700 buildings holding 2,269 units had registered for a lottery offering 200 conversions.

Tenancy in common and the condominium are priced and financed apart.

A study the City of San Francisco commissioned put the value gained by converting a tenancy in common unit to a condominium at about fifteen percent. That study was dated January 2011, and the city's own economic impact report repeated the figure in April 2013. It describes San Francisco alone, and it measures what an owner gains on conversion instead of the difference between two current sale prices.

The state regulator, in guidelines dated March 2018, separates two ways a tenancy in common is financed, and neither is the mortgage a condominium buyer signs. Under individual financing, a buyer borrows against that buyer's own undivided interest and the property carries no blanket encumbrance. Under group financing the whole building stays subject to one blanket loan, and the department requires an eighty percent presale threshold before approving it.

The federal survey that records who owns and who rents does not count cooperative housing on its own terms. A cooperative unit is recorded as owner occupied only where its shareholder lives there, which is the same rule applied to a condominium. In Los Angeles, buildings of two to ten units make up about half the city's rent stabilized stock, and organizational ownership of them grew between 2018 and 2023. The statewide rent cap limits most annual rent increases to five percent plus the regional change in the cost of living, or ten percent, whichever is lower.

The Subdivision Map Act and the city's own ordinance both apply.

A conversion to condominium, community apartment or stock cooperative form is a subdivision under the Subdivision Map Act, and a tenancy in common is not. The Department of Real Estate issues the public report a subdivider holds before any unit may be sold. San Francisco's own code exempts a stock cooperative's conversion to condominium from that annual cap once three quarters of its units have been owner occupied for three years. The city's expedited conversion program was suspended by litigation and resumed taking applications on April 22, 2024, a resumption its public works department still describes as temporary.

The Map Act also exempts certain older stock cooperative and community apartment projects from a new map, keyed to recording dates the statute itself fixes. Your building's own governing documents and California's condominium statutes set what an owner vote must carry, and your counsel reads both against your building. Transfer taxes, and the other tax questions a California conversion raises, are covered on the tax page.

California buildings in Hutton's case studies.

Hutton's completed conversions include cooperative buildings in California. Each of them is set out, with the years it spans, in the case studies filtered to California.