Existing residences in the manufacturing zoning districts. Reconstruction of existing residences in the manufacturing zoning districts: The reconstruction of an existing residential use in the M-1 or M-2 District, which has been damaged or destroyed by catastrophe or act of God, is permitted, provided the reconstructed building does not exceed the original floor area of the structure, and provided such reconstruction is commenced no later than one year after the date of the damage or destruction, and provided the building is in conformance with all other provisions of this chapter.