285 Central Park West, #PHN
Between 88th and 89th streets
$16.5 million

Maintenance: $3,971
Lisa Lippman/Brown Harris Stevens

This three-bedroom duplex penthouse at the St. Urban features a bi-level library/office inside the building’s northern turret – the lower room with built-ins is for “working” and the upper room with porthole windows is for “thinking.” About 4,000 square feet, this co-op offers an intimate view of the Central Park Reservoir and overlooks the Fifth Avenue skyline and beyond. It benefits from the curved mansard roof that provides skylight-like light patterns. The first floor contains the living room, dining room, library/office, kitchen (separated from the dining area by a copper “membrane” wall), master suite with two baths and dressing rooms, additional bedroom and bath, a service elevator entrance/laundry area, and terrace. The second floor features the library/office, an accompanying terrace (with park, Empire State Building, and Midtown skyline views), a third bedroom with bath, and second laundry room. There are two fireplaces as well. It is in a full-service building with a fitness room, basketball court, and bicycle storage.

455 Central Park West, ‘The Chapel’
Between 105th and 106th streets
$17.5 million

Common Charges: $4,595
Approximate Monthly Taxes: $1,083
Nikki Field/Sotheby’s International Realty

This four-level condo, about 5,000 square feet, is located in the Chapel of St. Elizabeth of Hungary, part of a gothic-style landmark with several turrets that was once the New York Cancer Hospital building. The main floor has a living room with arched windows, hand-painted gold leaf walls, 28-foot-high vaulted ceilings, stone columns, and a Tweed House Rotunda – all restorations designed to resemble the original structure. Also on that floor are the gallery, reception area, living room (with a wood-burning fireplace), dining room, kitchen, library, and bath. Upstairs is a mezzanine with a sitting area (it has a gas fireplace). Below is the master suite (including a dressing room), two additional bedrooms and en suite baths, a guest suite, and a second gallery. On the fourth level, there is a one-bedroom “staff quarters” unit. Amenities include doorman and concierge service, garage, valet, and fitness center (including a pool) and spa, among others.

2109 Broadway, #15-70/65
At 73rd Street
$3.85 million

Common Charges: $2,402
Approximate Monthly Taxes: $1,050
Roger Erickson/Sotheby’s International Realty

Located in the Ansonia, this listing includes two properties that can be combined into a 2,000-square-foot apartment: a two-bedroom with a circular living room in the building’s 15th floor turret and an the corner one-bedroom next door. The first unit features a foyer, gallery, kitchen, two bedrooms, and one bath. Its living room has eastern and southern exposures (including a view of the San Remo), a decorative fireplace, and French doors separating the room from the gallery. The second unit includes a foyer, kitchen, living room, bedroom, and bath. Both properties feature arched windows. Amenities include doorman service, a roof terrace, storage, and parking.