In all nonresidential zoning districts, no nonconforming nonresidential building destroyed or damaged from any cause to the extent, as determined by the Building Inspector, of over 50% of the value of its structure above the foundation shall be restored in nonconforming form or location on the lot or for the continuance of a nonconforming use therein. Any such building destroyed or damaged accidentally due to fire, explosion or other cause to the extent, as determined by the Building Inspector, of not more than 50% of the value of its structure above the foundation may, if so permitted by the Board of Appeals, be restored in substantially the same location, provided that it be not enlarged and that it comply with height, yard, area and other requirements of the schedule, and provided also that the Board of Appeals may permit the continuance without enlargement of such previous existing nonconforming use subject to such additional limitation and safeguards as it may deem necessary in the public interest for the protection of nearby conforming uses. Anything to the contrary in this subsection notwithstanding, the Board of Trustees may, by special permit issued in accordance with the provisions of §
220-6 of this chapter, authorize a nonconforming golf clubhouse to be reconstructed or replaced, in whole or in part (but in no case enlarged), for its prior nonconforming use in substantially the same location and may permit the construction or replacement of any ancillary structure necessary or appropriate for such golf club use, provided that, in each such case, the Board of Trustees finds that such construction, reconstruction or replacement furthers the goal of open space preservation and the purposes of §
220-7 of this chapter, maintains or improves the relationship between the subject property and the surrounding community, and results in improvement in the public welfare, health, safety and applicable environmental concerns; and unique circumstances exist that support the need for such construction, reconstruction or replacement. Such special permit may include such conditions and restrictions relative to the use and operation of such nonconforming use as the Board of Trustees may find are necessary to achieve such purposes.