We used to live a block from this old brick manufacturing building at the corner of Wythe and South 4th Street in Williamsburg and used to love going to the Roebling Hall art gallery that used to be in the ground floor. We hadn’t noticed until this week that a sizable addition is springing up on the roof. It looks like it’s part of a plan to convert the entire building to residential. Total units: 69. GMAP P*Shark DOB