California Code, Revenue and Taxation Code - RTC § 20640.2

(a) “Possessory interest” means (1) possession of, or right to the possession of land located in this state whether or not coupled with ownership of the residential dwelling on the same, or (2) a possessory interest or right of occupancy on tax exempt land;

(b) “Residential dwelling” means a dwelling occupied as the principal place of residence of the claimant, and so much of the land surrounding it as is reasonably necessary for use of the dwelling as a home, located on possessory interest property. It shall include condominiums and affixed manufactured homes upon which property taxes, as defined in subdivision (c), are assessed. It also includes part of a multidwelling or multipurpose building and a part of the land upon which it is built.

(c) “Property taxes” means the amount of property tax for which the claimant is personally liable as assessee or is obligated to pay directly to the tax collector pursuant to the terms of the agreement establishing the possessory interest, including all ad valorem property taxes, special assessments, capitalization of leasehold interest, and other charges or user fees which are attributable to the residential dwelling on the county tax bill and the ad valorem property taxes, special assessments, capitalization of leasehold interest, or other charges or user fees appearing on the tax bill of any chartered city which levies and collects its own property taxes.