Any permit issued shall become invalid unless the work authorized by it has been commenced within six months after its issuance, or if the work authorized by such permit is suspended or abandoned for a period of one year after the time the work is commenced, provided that, for cause, one or more extensions of time, for periods not exceeding ninety days each, may be allowed in writing by the Commissioner of Buildings.
(Ord. 178-1959.  Passed 9-14-59.)