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In all districts, as indicated, primary business entrances, show windows or signs may be located on any frontage within a Manufacturing District, if the Commissioner of Buildings finds that the zoning lot on which the business entrance, show window or sign is to be located:

1. is divided by a boundary between the Manufacturing District and a Residence District; or
2. is presently in the same ownership as adjoining property located in a Residence District, and no building in the Residence District exists, or will in the future be erected, within a distance of 75 feet from the Manufacturing District, as evidenced by deed restrictions filed in an office of record binding the owner and his heirs and assigns.