Here’s the facade up at 268-270 St. Marks Avenue, the new Prospect Heights build between Underhill and Venderbilt avenues. The lot sold in December of 2010 for $1,225,000. According to DOB permits, the building will house only three units. That glassy four-story build to the left is 272 St. Marks Avenue, a condo building that hit the market a few years ago. GMAP