If the Board approves an application for a change of zone subject to certain conditions or the fulfillment of certain requirements, or approves an application to rescind or modify existing covenants, a declaration of covenants and restrictions containing the newly established or modified covenants and restrictions shall be filed by the applicant at his or her own cost and expense in the Office of the Suffolk County Clerk within two (2) years of the adoption of the Town Board resolution. The Town Clerk shall not file the local law with the Secretary of State until such declaration of covenants and restrictions has been properly filed by the applicant. If the applicant wholly fails to file the declaration, or fails to file the declaration within the requisite period of time, then the resolution of the Board granting an approval shall have no force and effect and the property shall retain its original zoning classification; or, in the case of an application to rescind or modify existing covenants or restrictions, no rescission or modification will have taken place. The Town Board may, upon good cause shown by the applicant, extend an applicant's time to file the covenants and restrictions as long as an application for such extension of time is filed with the Town Clerk before the expiration of the original period, the extension does not exceed one (1) year, the expiration of such period has not been caused by the negligent act or misfeasance of the applicant, and there is no harm or prejudice to the Town or public, as determined by the Town Board. The burden of proof shall be on the applicant.