California Code, Financial Code - FIN § 7505.5

(a) A savings association may make loans the principal purpose of which is to provide financing with respect to what is, or what is to become, primarily residential real estate, for which the association relies substantially on the borrower's general credit standing and projected future income for repayment, without other security, or relies on other assurances for repayment, including guarantees or other obligations of third parties.

(b) An association's aggregate investment in residential real estate loans described in subdivision (a) shall not exceed an amount equal to 5 percent of the association's assets.