No existing structure devoted to a use not permitted by this chapter, in the district in which it is located shall be enlarged, extended, constructed, reconstructed, moved or structurally altered in a manner which would increase the area by more than 50 percent of the area defined as nonconforming on August 11, 1975 without approval by the board of adjustment.

Any nonconforming use may be extended throughout any parts of a building which were manifestly arranged or designed for such use at the time of adoption or amendment of this chapter, but no such use shall be extended to occupy any land outside such building.

Any structure or structure and land in combination, in or on which a nonconforming use is converted to conform to the regulations for the district in which such structure is located, the nonconforming use may not thereafter be resumed.

When a nonconforming use of a structure, or structure and premises in combination, is discontinued or abandoned for 12 consecutive months, the structure, or structure and premises in combination, shall not thereafter be used except in conformance with the regulations of the district in which it is located.

Where nonconforming use status applies to a structure and premises in combination, removal or destruction of the structure shall eliminate the nonconforming status of the land.

The foregoing provisions of this section shall also apply to buildings, structures, land or uses which hereafter become nonconforming due to any reclassification of districts under this chapter or any subsequent changes in the regulations of this chapter.

Nothing in this chapter shall be deemed to prevent the strengthening or restoring to a safe condition of any building or part thereof declared to be unsafe by any Township official charged with protecting the public safety, upon order of such official.