Restriction on erection of or addition to buildings within street alignment or building line

(1) No person shall construct any portion of any building within a street alignment defined under section 221, provided however that the Chief Commissioner may in his discretion permit additions to a building to be made within a street alignment, if such addition merely add to the height and rest upon an existing building or wall, upon the owner of the building executing an agreement binding himself and his successors in interest,- (a) not to claim compensation in the event of the Chief Commissioner at any time thereafter calling upon him or his successors to remove any building erected or added to in pursuance of such permission or any portion thereof; and (b) to pay the expenses of such removal: Provided that the Chief Commissioner shall, in every case in which he gives permission, report his reasons, in writing to the standing committee. (2) If the Chief Commissioner refuses to grant permission to erect or add to any building on the ground that the proposed site falls wholly or in part within a street alignment prescribed under section 221 and if such site or portion thereof which falls within such alignment be not acquired on behalf of the corporation within one year after the date of such refusal, the corporation shall pay reasonable compensation to the owner of the site. (3) No person shall erect or add to any building between a street alignment and a building line defined under section 221 except with the permission of the Chief Commissioner who may when granting the permission impose such conditions as the standing committee may lay down for such cases.