request a special exception to erect one “single family attached dwelling, limited to two dwelling units.” Rather, Applicant requested permission to erect 11 duplexes on one lot, for a total of 22 new dwelling units. The block on which the Property is located contains 17 single-family detached dwelling units. N.T. at 86. The proposed 22-unit complex would more than double the number of dwelling units in just that block and outnumber the 17 single-family detached dwelling units. N.T. at 86. Such an increase in the number of duplexes will significantly alter the character and composition of the surrounding neighborhood from predominantly single detached dwelling units to predominantly duplexes. See Blair v. Board of Adjustment of Borough of Hatboro, 403 Pa. 105, 169 A.2d 49, 50-51 (1961) (<HOLDING>). Such an immediate alteration in the
holding the accumulation of five gasoline service stations within a radius of 350 feet has a definite effect on the character of the immediate neighborhood  zoned primarily for retail business holding where the defendants engaged primarily in the business of providing delivery services that onfoot delivery workers constituted an integral part of the  defendants business holding that interstate shipments to a warehousedistribution point through to samestate retail outlets retained their interstate character where the warehouse was merely a convenient instrumentality for the division of the shipments coming to it and the continuation of the movement of each part to the retail stores holding to the same effect holding that service is not avoided by service on a partys attorney as service on an attorney is ineffective unless he has been authorized to accept such service