Every principal building shall be built upon a lot with frontage upon an improved and approved street in accordance with the street standards established by the Borough.

Any property which contains access to one or more approved and improved streets at its property line but does not contain sufficient street frontage as required herein shall not be construed to be landlocked. Where such conditions do exist or are created by virtue of a subdivision, no building permit or occupancy permit shall be granted unless and until the property contains the required amount of street frontage as required herein.

This provision is not to be construed to provide any building or zone which contains less street frontage than required herein or to create a building or zone lot, with an existing structure or structures located thereon, with less street frontage than as required herein.