Cal. Revenue and Taxation Code § 3695.5

In addition to the provisions of Sections 3695 and 3695.4 relative to objections to sales, any nonprofit organization may file with the county tax collector written objection to the sale for taxes of, and a written application to purchase in accordance with Chapter 8 (commencing with Section 3771), any residential or vacant real property that the nonprofit organization states in writing that it will: (a) In the case of residential real property, rehabilitate and sell or rent to, or otherwise use the property to serve, low-income persons. (b) In the case of vacant real property, construct residential dwellings on the property and sell or rent the property to low-income persons, otherwise use the property to serve low-income persons, or dedicate the vacant property to public use, including those uses referred to in subdivision (a). The objection and application shall be filed with the tax collector before the date of the first publication or posting of the notice of intended sale pursuant to Sections 3702 and 3703. If the nonprofit organization files an objection and application in compliance with this section and with any conditions of sale established pursuant to Section 3795.5, the tax collector may not proceed with the sale of the property. The terms “nonprofit organization,” “low-income persons” and “rehabilitation” shall have the same meaning in this section as in Chapter 8 (commencing with Section 3771).