Every landlord subject to the provisions of this act may, in lieu of depositing escrow funds, guarantee that any escrow funds, less cost of necessary repairs, including interest thereon, shall be returned to the tenant upon termination of the lease, or on surrender and acceptance of the leasehold premises. The guarantee of repayment of said escrow funds shall be secured by a good and sufficient guarantee bond issued by a bonding company authorized to do business in Pennsylvania.
68 P.S. § 250.511c