In accordance with state law, any plat or part thereof may be vacated by the owner of the parcel, at any time before the sale of any lot therein, by written vacation instrument to which a copy of the plat is attached. If there are public service facilities in any street, or other public way, or easement shown on the plat, the instrument shall reserve to the city or other public entity or public utility owning those facilities the property, rights-of-way, and easements necessary for continuing public service by means of those facilities and for maintaining or reconstructing the same. If there are no public service facilities in any street or easement, then those streets and easements shall be vacated without any reservation for utilities. The vacation instrument shall be approved by the City Council in the same manner as plats of subdivision, and shall also be approved by the public utilities involved. In the case of platted parcels wherein any lots have been sold, the written instrument must also be signed by all the owners of the lots in the parcel. In cases where a public right-of-way, street, or alley is to be vacated, a public hearing on the vacation shall be held by the City Council, prior to the City Council approving or disapproving the vacation.