Last month, the greater Washington, D.C., estate of late AOL co-founder Jim Kimsey found a buyer. The property had been listed at $63 million prior to the sale, but an offer of $45 million was accepted, setting a new record in that market.

For Kimsey, the falls had been something of a lifelong project. He bought the land in 1999, for $7.6 million. Several years later, he purchased the Frank Lloyd Wright-designed home next door—the Marden House, built in 1959—and it became part of the estate, a stylistically lavish and architecturally significant guest house that deepens the property’s narrative and increases its cachet.

The main house features a limestone exterior; postmodern architecture mixes French and American styles, with Craftsman elements visible. There are six en-suite bedrooms in the home, but the property total is 9 bedrooms and 20 baths, with nearly 49,000 square feet of interior living space between the main house, gate house and guesthouse.

The amenities are numerous. An underground parking garage can accommodate 30 cars. Specialty rooms in the main house include a media room, a reading room with a wet bar, and lounge room with a bar.

The setting is nothing short of spectacular. The house is situated on 3.2 acres, and positioned on a hill overlooking the Potomac. A terrace with a spa and zero-edge pool surveys the river and forested landscape.