Cal. Civ. Code § 1917.330
Lenders may make shared appreciation loans for seniors pursuant to this chapter for the refinancing of real property improved with one- to four-dwelling units, including structures ancillary to such dwelling units and including attached single-family dwelling units, single-family mobilehome units, residential condominium units, and dwelling units within a planned unit development. Shared appreciation loans shall be made to refinance only owner-occupied dwelling units, but in the case of two- to four-unit dwellings financed under this chapter, only one of the units need be owner-occupied. A dwelling unit shall be conclusively deemed to be owner-occupied for purposes of this chapter with respect to initial qualification for participation in the loan program if a borrower certifies in writing to the lender at the time the loan is made that he or she will occupy the property.
Nothing contained herein shall be deemed or interpreted to restrict a lender from providing a shared appreciation loan based solely upon the value of the real property upon which the borrower's dwelling is situated, secured only by that real property and not by the improvements thereon. In that case, the lender's actual contingent interest, and any other necessary calculations, shall be based upon the land value alone, not taking into account any improvements thereon. This paragraph is declaratory of existing law.
Ca. Civ. Code § 1917.330