Architect Alex Gil and his wife, Claudia DeSimio, affixed a 750-square-foot addition to the roof of a 19th century Williamsburg townhouse, transforming their cramped third-floor apartment into a modern duplex.  Photo 4 of 7 in Homes with Brick Facades by Allie Weiss from Get an Advance Look at the Amazing Residences on Dwell's Brooklyn Home Tour

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Architect Alex Gil and his wife, Claudia DeSimio, affixed a 750-square-foot addition to the roof of a 19th century Williamsburg townhouse, transforming their cramped third-floor apartment into a modern duplex.