If the mobile home is located on its property on the date of the adoption of this amendment, the mobile home may be maintained or repaired in the same manner as if a mobile home were a permitted use in the R-2 Residential (mobile home) district, except if the mobile home is replaced, it must be replaced by a new manufactured home that is not more than five (5) years old. The new manufactured home must be permanently affixed to a permanent foundation. The owner of the lot upon which the manufactured home is to be placed shall make application and obtain a building permit from the City of Perry. There shall be no more than one (1) residence per lot. A house, whether occupied or not, is considered a residence.