20 West 90th Street

This immaculate four-unit brownstone coop has condo-like rules. There are four units, all with wood-burning fireplaces, three have well-kept outdoor spaces, and two are duplexes. There is common laundry in the basement as well as a generous storage area dedicated for each apartment. Maintenance is kept low as it is a self-managed building. On the 2011 Best Block of the Upper West Side, 90th street leads directly into a pedestrian-only walkway to Central Park, mere steps the Reservoir.