Limits on storage and use. In no case shall self-service storage facilities permit the storage or maintenance of radioactive, toxic, explosive or controlled substances. The servicing or repair of automotive equipment, tools or machinery and the construction or fabrication of goods or materials shall not take place on the site, either inside or outside the bounds of an individual storage unit. The operation of power tools, spray equipment, compressors and other equipment shall not be permitted as an adjunct to the use or lease of any storage unit. Auctions, garage or tag sales or any other commercial or private sales shall not take place on the site by the lessees of storage units. The owners or operators of the site may conduct public or private sales on the site solely for the purposes of enforcing liens pursuant to § 182 of the Lien Law of the State of New York no more than three times per calendar year. Parking spaces required pursuant to Subsection 3 may not be rented as, nor used for, vehicular storage spaces. No additional parking spaces other than those required pursuant to Subsection (3) of this section may be provided for the unenclosed storage of vehicles or items, including, but not limited to, automobiles, motorcycles, trucks, trailers, vans, recreational vehicles, campers, boats or water craft.