609. Limitation of service charges at common law.

At common law, where the landlord is entitled (under the terms of the lease) to expend money on services and then to recoup the expenditure from the tenants, there is implied in the contract a term that the service charge is to be fair and reasonable1. Whenever the giving of a certificate as to the amount of the service charge, or the doing of any other act or happening of any other event, is stipulated by the lease to be a condition precedent to the payment of the service charge, nothing is recoverable until that condition precedent has been