 It is perfectly legal, and not uncommon in the given situation, for a building owner to re-apply for a TCO, following all the steps and inspections required originally, in order to hypothetically extend their TCO for another period of time.Temporary certificates of occupancy are generally sought after and acquired when a building is still under minor construction, but there is a certain section or number of floors that are deemed to be habitable, and, upon issuance of TCO, can legally be occupied or sold.In New York City, for a building to obtain a certificate of occupancy (CO), the structure must pass a series of inspections, as well as a walk-through from the Department of Buildings.