Civil Code §1947.3 provides that a landlord or landlord's agent must allow a tenant to pay rent and the security deposit by at least one form of payment that is neither cash nor electronic funds transfer, unless the tenant has previously attempted to pay with a check drawn on insufficient funds or stopped payment, in which case the landlord may demand cash for up to the next three months. Any waiver of the tenant's rights under this section is void.

Myron Moskovitz