Setting forward building to improve line of street.- The

Commissioner may, upon such terms as he thinks fit, allow any building to be set forward for the purpose of improving the line of a public street and may, with the sanction of the standing committee, by notice require any building to be so set forward in the case of reconstruction thereof or of new construction.

Explanation.- For the purpose of this section a wall separating any premises from a public street shall be deemed to be a building; and it shall be deemed a sufficient compliance with permission or requisition to set forward a building to the street alignment if a wall of such material and dimensions as are approved by the Commissioner is erected along the said line.