No townhouse in Brooklyn is immune from the condo conversion craze.  After a while the wide plank floors, exposed bricks and waterfall counters all begin to look the same.  But this particular conversion on Union Street in Carroll Gardens caught our eye.   341 Union Street is a four-story turn-of-the-century townhouse that has been converted into four floor-through residences.  The penthouse apartment, stunning in its own right, delivers a knock-out punch with ...

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