Section 17(5) in Haryana Urban Development Authority Act, 1977
(5)Any person aggrieved by an order of the Estate Officer under section 16 or under this section may, within a period of thirty days of the date of the communication to him of such order, prefer an appeal to the Chief Administrator in such form and manner, as may be prescribed :Provided that the Chief Administrator may entertain the appeal after the expiry of the said period of thirty days, if he is satisfied that the appellant was prevented by sufficient cause from filing the appeal in time.