Where, upon complaint of the Building Inspector, any nonconforming structure or use shall be found by the Plan Commission as a matter of fact to be a detriment to the public health, safety, or general welfare, such structure shall be ordered to be removed or such use to be discontinued within such time as the Plan Commission may deem reasonable. Upon failure to carry out such order, the City may take such steps as are necessary to remove such structure or discontinue such use and assess the cost thereof against the property owner.