If, within a 30-day period specified in SCC 23.24.210, the owner does not file a request for a hearing, the local agency may, at any time thereafter, make a determination that the affected parcels are to be merged or are not to be merged. A determination of merger shall be recorded as provided for in SCC 23.24.230 no later than 90 days following the mailing of notice as required by SCC 23.24.200. (Formerly 23.24.024)