Continuation. A nonconforming structure, except a single-family dwelling and its accessory buildings and structures, which is damaged to an extent of more than 50% of its replacement cost shall not be reconstructed except in conformity with the regulations of this chapter. A nonconforming structure, except single-family dwellings and their accessory structures, which is damaged to an extent of 50% or less of its replacement cost, may be replaced, provided that the replacement is commenced within two years of the date of damages, and is diligently pursued to completion. Failure to complete replacement shall result in the loss of legal, nonconforming status, unless the Township Board, after a hearing, finds good cause for the delay.