Any lot recorded prior to the adoption of this title, any lot of record in any area heretofore or hereafter annexed to the city, and any lot affected by an action of eminent domain as described in Chapter 17.16, which are substandard with respect to the minimum lot area requirements of this chapter, shall be classified as a "legal substandard lot." The existence of a legal substandard lot shall not be deemed to change any other requirement or regulation pertaining to such lot. Except as provided under subsection H of this section, no lot shall be deemed to be a legal substandard lot where such lot, at the time of the adoption of this title, or upon annexation or upon being affected by an action of eminent domain, has a common side lot line with another lot under the same ownership.