We spotted this new development on 20th Street between 5th and 6th Avenue last weekend and didn’t have to even go online to know that it had Mr. S written all over it. The formerly empty lot, which the developer bought in late 2004 for $1.3 million, now has 10,000 square feet of residential space on it spread over eight one- and two-bedroom apartments. Despite the banner on the exterior, the building has not hit the Corcoran site yet. We were able to deduce, however, that the agent handling the listing will be David Perez, who’s also the master of ceremonies over at The Simone. How’s the nabe feeling about this puppy? The block is rather, ahem, eclectic to start with, so we’re fine with the Scarano glass front; we just wish they’d stopped at four stories, as the building permit indicates. GMAP P*Shark DOB