In the age of the Instagram bathfluencer, the newly listed penthouse unit at 400 West Ontario Street offers quite the photo opportunity.

In its airy master bathroom sits a lone porcelain bowl on white Turkish mosaic tiling, with a near birds-eye view of the downtown Chicago skyline through floor-to-ceiling windows.

“The tub is pretty darn insane,” says Ben Lalez, the Compass agent who listed the River North condo.

With a steep asking price of $3.9 million, Unit #1801 offers plenty more than a grandiloquent tub. Lalez calls it a “true penthouse,” meaning the sprawling 6,800-square-foot unit takes up the entire 18th floor of the Gallery 400 building, and includes a private elevator. It also offers views of the city in all cardinal directions from a wrap-around balcony. “I call it the walking track,” says Lalez.

The four-bedroom, three-and-a-half bathroom condo has changed drastically in recent years, most notably in price. It's currently listed for $2 million less than the $6 million it sold for in mid-2007, before the Great Recession. In 2015, while the unit was in foreclosure, a California-based investment company bought it for $2 million, hiring architect Richard Becker and interior designer Joseph Cortes to redesign it. Now, its original 1990s aesthetic is gone, and the in-unit swimming pool has been turned into a cavernous master closet.

Because really, with a tub like that, who needs a pool?