Cal. Civ. Code § 7-215

If an assisted project includes a unit occupied by a designated household and the assisted project is sold or conveyed after a protected action:

(1) the provisions of this subtitle concerning extended leases continue to apply despite the sale or conveyance;

(2) the new landlord shall provide each designated household with written notice of the sale or conveyance; and

(3) on or before the execution of a contract of sale, the seller shall provide the purchaser with written disclosure of each unit occupied by a designated household subject to the provisions concerning extended leases for designated households.