No building shall be erected, converted, enlarged, reconstructed or structurally altered, nor shall any building or land be used, arranged to be used, or designed to be used, in a manner which does not comply with all of the district provisions established by these regulations for the districts in which the building or land is located. Uses which are omitted from these regulations, not being specifically permitted, shall be considered prohibited until, by amendment, such uses are written into these regulations.
   Determination of whether or not a use is specifically permitted, by virtue of being similar in character to a specified permitted use in the district, shall be made by the Planning Commission, based on the purpose of the district regulations and this Zoning Ordinance. The Planning Commission shall have no authority to determine whether or not a proposed use is similar in character to a conditionally permitted use in any zoning district.
   No land shall be occupied or used, and no building hereafter erected, altered, or extended shall be used or changed in use until a Zoning Permit has been issued by the Zoning Inspector and a Certificate of Occupancy has been issued by the Building Department stating that the building or proposed use thereof complies with the provisions of this Zoning Ordinance.