Park Slope has never lacked for ambition, but the stone-faced double-wide at the center of Lillian Heidenberg's listing is something the neighborhood does not produce very often: a Romanesque revival mansion wide enough to feel like it borrowed a neighbor's lot and tasteful enough that nobody objected.

The property hit the market this week at $18.5 million, a number that lands it comfortably at the top end of what Brooklyn asks of buyers who have run out of reasons to look at Manhattan. The home's footprint alone sets it apart — double-wide lots in this stretch of Park Slope are the kind of thing that gets photographed at street level by people who will never ring the bell.

Inside, the specification sheet earns the price. A private residential elevator handles the vertical, which matters when a house is this tall. The interiors have been maintained and furnished at a register that rewards a slow walk-through. And then there is the Alex Katz — a painting by the now-legendary New York figurative artist, whose market has appreciated at a pace that makes the listing's ask feel almost conservative when you factor the canvas in.

Heidenberg's home has the cultural texture that Park Slope buyers at this level tend to expect: original art, serious architecture, a block that photographs well in October. The $18.5 million ask positions it as the neighborhood's statement listing for the season. The elevator alone handles four floors. The Katz handles the rest.