Section 5(2)(c) in The Urban Land (Ceiling And Regulation) Rules, 1976
(c)Where the efforts to serve the draft statement and the notice, on the holder of the vacant lands or, as the case may be, any other person referred to in clause (a), in the manner specified in that clause is not successful for reasons other than the reason referred to in clause (b), the draft statement and notice shall be served by affixing copies of the same in a conspicuous place in the office of the competent authority and also upon some conspicuous part of the house (if any) in which the holder of the vacant lands or as the case may be, the other person is known to have last resided or carried on business or personally worked for gain.