Within the fire limits, any existing frame, wood or
other combustible structures which, in the judgment of the Superintendent
of Construction, may be damaged from any cause whatsoever to an amount
greater than 1/2 of the value thereof, exclusive of the foundations,
or may be in need of structural repairs to an amount greater than
1/2 of its value, exclusive of foundations, shall not be repaired
or rebuilt but shall be taken down, except that if said frame building
shall have been occupied exclusively as a one-family residence, when
said building is damaged by fire, decay or otherwise as mentioned
above, the amount of permissible damage shall be increased to 60%.