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

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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 regular line of a street if a wall of such material and dimensions as are approved by the Commissioner is erected along the said line.