It shall be unlawful for any portion of any subdivision of land in the County to be sold prior to the recording of a subdivision map or to adjust the boundaries between existing lots without recording a boundary line adjustment effective July 1, 1973. Any contract for the sale of land within a proposed subdivision shall contractually obligate the seller to record the required map before title is transferred. (Ord. 2573 § 5 (part), 2001; Ord. 2481 § 3 (part), 2000)