In order that nonconforming uses may be gradually brought into greater conformity with the requirements of this chapter, or that the adverse external effects of such nonconforming use may be reduced, an applicant may present and the Planning Board may review, or the Planning Board may propose a plan whereby, through landscaping, screening and buffer areas, the control of noise, smoke, odors, lighting and other external characteristics, architectural changes and the location and layout of parking areas and access drives, or by other appropriate means, will serve to reduce the adverse external effects of the nonconforming use and improve its relationship to neighboring properties and the community. As part of its review, the Planning Board shall determine that the proposed modifications to the nonconforming use shall not include any increase in the types of operation or intensity of such uses, although they may involve the relocation and redesign of activities and facilities on the property. Such plan shall be presented to the Town Board which, after public notice and hearing, may approve such plan. Within a period of not more than three years from the date the Town Board approves such plan, the owner of the property where the nonconforming use is located shall bring such use into compliance with such plan as a condition of continuing its legal nonconforming status under this chapter. The Town Board may, as a condition of approval, require that all improvements be completed simultaneously, or in accordance with a schedule established as part of any approval.