When considering a request for a map amendment, based upon the petitioner's contention that there has been a change in the character of the neighborhood, the Town Council may entertain any offer by the petitioner that the petitioner is willing to agree to conditions precedent being set by the Town Council if, based upon its findings of fact, it should agree to reclassify the subject property. Under such an agreement, the Council may impose such additional restrictions, conditions, or limitations as may be appropriate to preserve, improve, or protect the general character and design of the land and improvements being zoned or rezoned, or of the surrounding or adjacent land and improvements, and may, upon the zoning or rezoning, and pursuant to such an agreement, retain or reserve the power and authority to approve or disapprove the design of buildings, construction, landscaping, or other improvements, alterations, and changes to be made on the subject land to assure conformity with the intended purpose of this chapter and of the adopted plan of the Town, and to effectuate the agreement. In the event such an agreement is reached, it shall be reduced to writing, and thereafter all stated conditions shall be conditions precedent and the requested map change shall not become finally effective until all such conditions are carried out in full. In the event all such conditions are not carried out in full, the map change shall become null and void and the property shall revert to its former classification.