Don’t go chasing waterfalls — unless, that is, you consider them a good design choice. 

In Manhattan’s tony Gramercy neighborhood, this compound is looking for someone interested in buying both its historic bones, as well as its decidedly modern additions. 

The exterior of 225 E. 21st St. is unassuming enough: The Greek Revival multi-family townhouse was constructed in 1888 and is still defined by its historic brickwork and a weathered-looking entryway — the front door set back behind an accordion gate.

Inside, however, the space has been given a thoroughly unique makeover, leaving certain corners raw and others outfitted with imaginative water features. 

“Vintage New York on the outside, preserved on the inside, and transformed on the ground floor into a contemporary peaceful, watery retreat,” architect and current owner David Ling described the space to The Post. 

Ling purchased the property, formerly a dental factory, in 2000 and gutted it, before sculpting it into three separate loft units, according to the $7.5 million listing, which is held by Corcoran’s Stefania Cardinali. 

The largest and most memorable unit, located on the first floor, includes what was formerly the lower level of the building’s carriage house.

Not for the faint of heart, it has a cantilevered bed with a waterfall pouring out from beneath it. 

“You flip a switch, and water comes cascading out,” Cardinali explained to Realtor of the mechanism.

From the bed, the water flows 10 feet down to a moat — and then is recirculated back to the top. 

To dryly get from the bed to the living area, one must step across stones laid in the moat — a “drawbridge” of sorts, the listing explains.

Elsewhere, Ling has left other portions of the townhouse unfinished. 

“I enjoy the contrast, and I enjoy the layering of history,” he previously explained to Dwell. “I’m interested in juxtaposing polar differences in anything, really.”

Since listing, the building has gone viral, although this is not the first time it’s been publicized: It has also previously been featured on Netflix’s “Amazing Interiors.”