(a) No site or development plan required under this Zoning Code shall receive final approval unless a landscaping plan has been submitted and approved.
(b) No certificate of zoning compliance or certificate of occupancy shall be issued unless the following criteria are fully satisfied with regard to the approved landscape plan:
(1) Such plan has been fully implemented on the site; or
(2) Such plan, because of seasonal conditions, cannot be implemented immediately, but has been guaranteed by a postponed improvement agreement between the developer and the City in a form acceptable by the Legal Counsel and secured by a letter of credit, cash escrow or other instrument acceptable to the Legal Counsel in an amount equal to the cost of such installation plus a ten percent allowance for administrative costs, inflation and potential damage to existing vegetation or improvements.