Jamestown, N.Y., Code of Ordinances ch. 216 § 216-13

When required: A. No person shall permit the occupancy of a one-family rental dwelling, a building containing two or more dwelling units, or a mixed-occupancy building containing one or more dwelling units unless a valid certificate of occupancy is in effect for said building. If such a building is occupied in violation of this section, a ticket may be served on the owner of the building. The violation shall be considered a high-level violation for which the penalties set forth in § 215-68 of the Municipal Code shall apply. B. In addition to the requirements of Chapter 216 of the City Code, a certificate of occupancy or a conditional certificate of occupancy must be obtained within 60 days prior to the occurrence of any of the following: (1) The transfer of title to a new owner of any two-family dwelling unless a certificate of occupancy has been issued within two years of the transfer date. (2) The re-occupancy of a dwelling which has been entirely vacant for more than two months, unless a certificate of occupancy has been issued within a year of the re-occupancy. (3) A change of occupancy or use that would bring a dwelling under a different or additional classification of this chapter, the Building Code, Zoning Code, Fire Prevention Code or other provisions of the City Code. (4) The expiration or termination of a valid certificate of occupancy for a subject dwelling. (5) A change of occupancy whereby a one-family dwelling or a two-family dwelling is no longer occupied by the owner, or a spouse, child, parent or sibling of the owner. For one-family dwellings or two-family dwellings that are not occupied by an owner, or a spouse, child, parent or sibling of the owner, a certificate of occupancy or a conditional certificate of occupancy shall be obtained immediately, but in no event later than 60 days after notice is sent by the City by regular first-class mail to the owner, at the owner's address on file with the City.