Section 14(1)(a) in The Delhi Rent Control Act, 1958
(a)that the tenant has neither paid nor tendered the whole of the arrears of the rent legally recoverable from him within two months of the date on which a notice of demand for the arrears of rent has been served of him by the landlord in the manner provided in section 106 of the Transfer of Property Act, 1882 (4 of 1882);