On any building devoted in whole or in part to any
, work
be done in any period of twelve (12) consecutive months on ordinary repairs, or on repair or replacement of non-bearing walls, fixtures, wiring or plumbing to an extent not exceeding fifty (50) percent of the assessed value of the building, provided that the cubic content of the building as it existed at the time of passage or amendment of this Ordinance shall not be increased.
Nothing in this Ordinance
be deemed to prevent the strengthening or restoring to a safe condition of any building or part thereof declared to be unsafe by any official charged with protecting the public safety, upon order of such official.