It shall be unlawful to use or occupy any structure or lot hereafter
erected or altered unless the Building Commissioner has issued a certificate
of occupancy and has specified thereon the use to which the structure
or lot may be put. Applications for certificates of occupancy and
compliance shall be filed coincident with the application for building
permits and shall be issued or refused in writing for cause within
five days after the Building Commissioner has been notified, in writing,
that the erection or alteration of such buildings has been completed.
A record of all certificates shall be kept on file in the office of
the Building Commissioner. Buildings accessory to dwellings when completed
at the same time shall not require a separate certificate of occupancy.