POL Government Elected Officials Auditor Mary Hull Caballero Charter, Code & Policies City Code & Charter Online Code & Charter Title 8 Health and Sanita Chapter 8.12 Permits
8.12.040 Life of Permit.

If any work or undertaking for which a permit has been issued is not commenced within a reasonable time, not to exceed 90 days from the date of the issuance of the permit, or if after the commencement of such work or undertaking the same is discontinued for 1 year, or less, and there appears to be no reasonable grounds for delay, said permit shall automatically become void and of no effect beyond that which has been lawfully performed or accomplished.