California Code, Government Code - GOV § 62103

(a) A provision that requires, whenever dwelling units housing persons and families of low or moderate income are destroyed or removed from the low- and moderate-income housing market as part of a revitalization project, the authority to, within two years of such destruction or removal, rehabilitate, develop, or construct, or cause to be rehabilitated, developed, or constructed, for rental or sale to persons and families of low or moderate income an equal number of replacement dwelling units at affordable housing costs, as defined by Section 50052.5 of the Health and Safety Code, within the territorial jurisdiction of the authority, in accordance with all of the provisions of Sections 62120 and 62120.5.

(b) A provision that prohibits the number of housing units occupied by extremely low, very low-, and low-income households, including the number of bedrooms in those units, at the time the plan is adopted, from being reduced in the plan area during the effective period of the plan.