If such reservations are required, at the time of approval of the final map or parcel map of the subdivision, the city council shall enter into a binding agreement to acquire the areas reserved within two years after the completion and acceptance of all improvements, unless such period of time is extended by mutual agreement of the subdivider and the city. The purchase price for the area or areas reserved shall be the market value thereof at the time of filing the tentative map plus the taxes against the areas reserved from the date of the reservation to the date of acquisition, and any other costs incurred by the subdivider in the maintenance of such reserved areas, including interest costs incurred on any loan the proceeds of which were used to acquire the area or areas reserved. (Ord. 90-1 (part), 1990)