
Quoting
Cal. Civil Code, Sec. 54.1(b)(3)(A)
(b)(3)(A) A person renting, leasing, or otherwise providing real property for compensation shall not refuse to permit an individual with a disability, at that person’s expense, to make reasonable modifications of the existing rented premises if the modifications are necessary to afford the person full enjoyment of the premises. However, any modifications under this paragraph may be conditioned on the disabled tenant entering into an agreement to restore the interior of the premises to the condition existing before the modifications. No additional security may be required on account of an election to make modifications to the rented premises under this paragraph, but the lessor and tenant may negotiate, as part of the agreement to restore the premises, a provision requiring the disabled tenant to pay an amount into an escrow account, not to exceed a reasonable estimate of the cost of restoring the premises.