If two or more lots or a combination of lots and portions of lots with continuous frontage in single ownership are of record at the time of passage or amendment of this chapter and if all or part of the lots with no buildings do not meet the requirements established for intensity or size, the lands involved shall be considered to be an undivided parcel for the purposes of this chapter and no portion of that parcel shall be used or sold in a manner which diminishes compliance with intensity or size requirements established by this chapter, nor shall any parcel be made which creates a lot with an intensity or size below the requirements stated in this chapter.
('91 Code, § 153.197)  (Ord. 1910-1954, passed 10-21-54; Am. Ord. passed 4-20-78; Am. Ord. 09-3306, passed 10-15-09)  Penalty, see § 153.999