Danpar Associates v. Falkha, 438 A.2d 1209 (1981)

Although the lease does not expressly provide for the situation which arose here where the renewal rent for the months of June, July, and August could not be determined until some time after it was payable, we have concluded that the plaintiff was within its rights in insisting that it be paid within the time allowed by the lease for payment of the September rent. The lease provided that the renewal term rent should be paid in equal monthly installments on the first day of each month. The default clause made the failure of a tenant to pay the rent, or any other monetary payment, within ten days after its maturity, a breach of the lease entitling the landlord to terminate it. The plaintiff's letter dated september 4 demanding payment by September 11 was within the authority granted to the landlord by the terms of the lease.