This co-op at 13 Gramercy Park South comes with the one thing everyone in the neighborhood wants: a key to Gramercy Park. It also comes with a lot of lovely prewar charm. Located in a 1847 brownstone, the full-floor 3BR/2.5BA unit features inlaid oak and mahogany floors, two gas fireplaces, and a window seat that overlooks the park. There's a conservatory off of the master bedroom, which leads to a private landscaped terrace. The home also has a keyed elevator entrance, a windowed kitchen with a lot of storage space (and forest green cabinetry), and a separate dining room. It's listed for $4.995 million.