Nothing in this subsection shall be deemed to prohibit or restrict the location of detached accessory structures of a minor and passive nature which are not normally or customarily so restricted, including, but not limited to, lighting fixtures, lawn furniture, mail boxes, planters, sign posts and similar structures, or accessory structures required for public utility purposes or as may be otherwise required by law. Such structures shall, however, be subject to any regulation or restriction herein specifically related thereto.