The impressive limestone facade on this Court Street building in Carroll Gardens conceals an art gallery on the first floor and two apartments on the each of the upper two floors, but now the whole building is on the market for $3.2 million. A buyer could certainly keep the current configuration, or, in keeping with the times, say, "the hell with art!" and turn the entire building into a huge, gaudy mansion. Either way. (As the brokerbabble puts it, the property offers "endless possibilities for a buyer.") The gallery/townhouse used to be the Hamilton Savings and Loan Bank, and was converted in 1980 by the family of the current owner.