Whenever a new residential facility is constructed on any lot upon which there presently exists a residential facility, and such existing facility is to be retained and occupied temporarily pending completion of the new residential structure, the maximum density prescribed for such lot shall be computed upon the basis of the new facility only. However, such existing facility shall be vacated and physically removed within one year after commencement of construction of the new facility unless the existing and new facility together shall conform to said maximum density requirements. (Ord. 1111, 2018)