The size and configuration of the subdivided lot shall depend upon the class of the historic resource and the natural characteristics and the landscaping of the subdivided lot and adjacent lots. Lot boundaries shall, in general, conform to the lines of identifiable natural features including landscaping, topography, geology, lot configuration, etc., on the site. Site development shall be based, in general on the standards for rehabilitation of this Part. Review and recommendations regarding the resource, its subdivided lot, and the proposed land developments shall be made by the East Fallowfield Historical Commission to the Planning Commission and the Board of Supervisors. The Board may require that a lot size be increased above the minimum lot size for the zoning district in which the resource is located if necessary to preserve the integrity of the resources cultural landscape. Conversely, in cases where the historic resource contains two or more contributing structures (barns, springhouses, etc.), the required lot size may be adjusted downward to accommodate conversion of these structures for residential use to preserve the integrity of the historic complex, by special exception granted by the Zoning Hearing Board pursuant to the standards and criteria set forth in § 27-2406, Subsection 1, above. Finally, in cases where only a contributing structure of 2,000 square feet or less remains, the required lot size may be adjusted downward to accommodate the construction of a new primary residential structure consistent with the historic and architectural character of the contributing structure, by special exception granted by the Zoning Hearing Board pursuant to the standards and criteria set forth in § 27-2406, Subsection 1, above.