Cal. Health and Safety Code § 33334.16

For each interest in real property acquired using moneys from the Low and Moderate Income Housing Fund, the agency shall, within five years from the date it first acquires the property interest for the development of housing affordable to persons and families of low and moderate income, initiate activities consistent with the development of the property for that purpose. These activities may include, but are not limited to, zoning changes or agreements entered into for the development and disposition of the property. If these activities have not been initiated within this period, the legislative body may, by resolution, extend the period during which the agency may retain the property for one additional period not to exceed five years. The resolution of extension shall affirm the intention of the legislative body that the property be used for the development of housing affordable to persons and families of low and moderate income. In the event that physical development of the property for this purpose has not begun by the end of the extended period, or if the agency does not comply with this requirement, the property shall be sold and the moneys from the sale, less reimbursement to the agency for the cost of the sale, shall be deposited in the agency’s Low and Moderate Income Housing Fund.