The site plan, as approved, shall be completed prior to issuance of a certificate of occupancy. At the applicant's request, the Building Inspector may allow the applicant to occupy the building(s) prior to completion of the site plan, provided all requirements of the Building Code are met. In such case, the Building Inspector, after consultation with the Planning Board, shall require the applicant to post surety, in the form of cash or, at the discretion of the Planning Board, a letter of credit in a form acceptable to the Planning Board, in an amount sufficient to ensure completion of the site plan and shall, after consultation with the Planning Board and Town Counsel, require the applicant to execute a surety agreement which shall specify a date of completion. Surety shall be held by the Town until the site plan is fully and satisfactorily completed. In the event the site plan is not completed prior to the agreed date of completion, the surety shall be made available to the Town to ensure completion of the site plan.