Library Days: 48 W. 86th St., 3rd Floor, Between Central Park West and Columbus Avenue

This Upper West Side co-op is in a Beaux Arts mansion less than a block from Central Park. The mahogany-paneled living room, once the townhouse's library (and later one for a small private girls' school), contains original parquet floors and built-in bookshelves. It also has a wood-burning fireplace with a marble mantel. About 1,600 square feet, the layout includes a foyer, kitchen (with granite countertops, high-end appliances, and a "banquette"- style dining area), gallery-turnedden, master bedroom and bath, second bedroom, an office (or third bedroom), and second bath. Design details include casement windows (in the master bedroom), a curved wall (in the foyer), transom windows (in the second bath), and a pocket door (separating the kitchen from the living room). There is central air conditioning, a washer/dryer, and private storage in the basement.

$2.375 million
Maintenance: $1,986
Broker: Josh Levine/Prudential Douglas Elliman