All improvements required to be installed pursuant to the subdivision regulations of the City shall be installed prior to the issuance of building permits for buildings or structures lying within the plat unless performance bonds and/or a letter of credit for sidewalks, street trees and erosion control insuring the completion of all required public improvements are filed with the City, under the provisions of Section 200.39. In no event shall occupancy permits be issued authorizing the occupancy of any dwelling or structure within any plat until all improvements have been completed and accepted by the City.