If you've got a thing for townhouses with turn-of-the-century details and need a rental to help with the mortgage, 720 Fourth Ave. is worth a look. The Greenwood, Brooklyn two-family is listed for $1,900,000 and measures 25-feet wide.

Built in 1899, the semi-detached townhouse has ornate, mirrored fireplace mantels, columns, pocket doors with etched glass, crown moldings, wainscotting, stained-glass windows, and refinished wood floors with inlaid designs.

The townhouse's electric and plumbing systems have been updated, as has the gas line; double-paned windows help reduce noise from the busy avenue outside. (It's a popular thoroughfare for both cars and trucks.)

The apartments feature built-ins throughout, and the owner's duplex, on the first and second floors, has a media/playroom, and office.

The kitchen could definitely used some updating, but it looks like the appliances are relatively new; the washer/dryer units are in the kitchen as well.

A deck is off the kitchen, and the listing says the wall art is made from reclaimed wood from the original Coney Island boardwalk.

The master bedroom has a walk-in closet with an Elfa system that can also be used as a dressing room.

The bathroom is in shades of vintage green, and features a stained glass window.

The two-bedroom, top-floor apartment includes similar period details, and offers Manhattan views. If desired, the apartment can be combined with the duplex below to create an even larger one-family home.

A four-room basement (not shown) with a full ceiling has a half-bath, and access to the street and the backyard.

The townhouse is two blocks from the R train at 25th Street; Industry City is close by, and many bars and restaurants can be found along Fifth Avenue and beyond.