California Code, Health and Safety Code - HSC § 32132.96

(a) Except as provided in subdivision (b), (c), or (d), a district that is authorized and elects to use the design-build process described in Chapter 4 (commencing with Section 22160) of Part 3 of Division 2 of the Public Contract Code for the construction of housing shall require that at least 20 percent of the residential units constructed be subject to a recorded affordability restriction for at least 55 years and be affordable to all of the following:

(b) Subdivision (a) shall not apply if the city, county, or city and county in which the district is predominantly located has adopted a local ordinance that requires a greater percentage of the units be affordable to lower income households, very low income households, extremely low income households, and persons and families of low or moderate income.

(c) Subdivision (a) shall not apply to any district that is authorized and elects to use the design-build process described in Chapter 4 (commencing with Section 22160) of Part 3 of Division 2 of the Public Contract Code for the construction of any health facilities or retirement facilities exclusively providing care or supportive services to the elderly, disabled adults, or individuals with dementia, including, but not limited to, residential care facilities for the elderly.

(d) Subdivision (a) shall not apply to any district that is authorized and elects to use the design-build process described in Chapter 4 (commencing with Section 22160) of Part 3 of Division 2 of the Public Contract Code for the construction of workforce housing that is otherwise required by local ordinance.