Any vacant lot legally existing at the time the ordinance causing such nonconformity was enacted, made nonconforming by the passage of such ordinance or any applicable amendment thereto, may be utilized for a permitted use, provided that it meets the requirements for existing lots of record set forth in § 296-136 and Schedule I attached to this chapter. Permitted uses may be expanded on a developed nonconforming lot, whether or not the lot meets the requirements of an existing lot of record, provided that all yard, setback, hard surface coverage, parking, floor area ratio and height requirements of this chapter are met.