Subdivision plots protected for three (3) years. Two (2) or more adjoining non-conforming subdivision plots, not in separate ownership, in a subdivision recorded, whether or not approved by the Planning Commission prior to the effective date of this Chapter, shall have three (3) years from the date of final approval of this Chapter by the Planning Commission to obtain a building permit. Any non-conforming plot in a subdivision, whether or not approved by the Planning Commission more than three (3) years prior to the effective date of this Chapter and not in separate ownership as of the effective date of this Chapter so as to qualify, shall not be eligible to receive a building permit, and said subdivision, part or plot thereof shall be resubmitted to the Planning Commission for reapproval in accordance with the applicable provisions of this Chapter. Any plot in a subdivision approved by the Planning Commission after the effective date of this Chapter, which conforms to the height and area regulations but which is made non-conforming as to height and area regulations by any future amendment, shall have three (3) years from the effective date of the future amendment or three (3) years from the date of final approval by the Planning Commission, whichever is sooner, to obtain a building permit. Any subdivision plot for which a permit is applied for after the time periods specified herein shall conform to all this Chapter's regulations.