Get a certificate Property owners in Philadelphia need certain certifications to rent, occupy, or sell property. Get a Certificate of Occupancy How to get a Certificate of Occupancy (CO) for a building, tenant space, or place of business. Get a Certificate of Rental Suitability How to get a certificate needed to rent out a property in Philadelphia. Get a Lawful Occupancy Sign How to get a Lawful Occupancy Sign (LO) for all or part of a building. Get a Temporary Occupancy Permit for a special event Get a permit to temporarily occupy a building for a special event.