Section 209(3) in The New Delhi Municipal Council Act, 1994
(3)No person shall construct or reconstruct any building or a portion thereof or any boundary wall or other structure whatsoever within the regular line of a street except with the written permission of the Chairperson:Provided that if within sixty days after the receipt of application from any person for permission to construct or reconstruct a boundary wall or portion thereof, the Chairperson fails to take steps to acquire the land within the regular line of the street in the accordance with section 212, then that person may, subject to any other provisions of this Act and the bye-laws made thereunder, proceed with the work of construction or reconstruction of such boundary wall or portion thereof.