(a) No vault or other structure below the sidewalk level shall be constructed between the street or alley line and the curb line so as to interfere with or obstruct any existing or proposed installation of the City, or any existing installation of public utility companies, except as such installation may be relocated by the owners thereof.
(b) The City reserves the right to construct at any time, under, over, or through such vault space or under sidewalk structure any installation needed for the public service without liability or compensation to the owner of such vault or under sidewalk structure.
(c) Every application for a permit for a sidewalk vault or other under sidewalk structure shall be accompanied by a written recorded agreement upon an official blank, signed by the owner of the abutting property, contracting to release and relinquish the whole or part of such vault space or other under sidewalk space if so directed by ordinance of Council, and to remove all machinery, fixtures and structural parts of the vault which conflict with or obstruct proposed installations of the City or, when so directed, to alter such vault or other under sidewalk structure so as not to conflict with or obstruct proposed installations of the City, and to construct any retaining walls or other structures necessary to support walk and roadway loads and resist lateral pressures where such vault or other under sidewalk structure is removed in whole or in part; all without cost to the City and without compensation therefor from the City.
(d) Where specific building lines are shown on the Zoning Maps, or where street widening is contemplated, the Director of Public Service may limit the dimensions of under sidewalk structures so that they will not interfere with street widening.