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Exclusive of an accessory private garage and a cabana permitted as an accessory to a swimming pool pursuant to § 252A(6) of Article XXV,
only one structure can be erected and thereafter maintained, and such structure shall be erected on the ground and in the rear yard only and shall not exceed 144 square feet of floor area, nine feet in height maximum and 12 feet horizontally maximum, unless authorized as a special exception by the Board of Appeals.