Notwithstanding the provisions of § 15.2-2241, provided the developer and the governing body have agreed on the delineation of sections within a proposed development, the developer shall not be required to furnish to the governing body a certified check, cash escrow, bond or letter of credit in the amount of the estimated cost of construction of facilities to be dedicated for public use within each section of the development until such time as construction plans are submitted for the section in which such facilities are to be located.