The 7,000 sq. foot mansion, set over 1.4 acres, played a backdrop to the couple's split, as it was where Ramona caught Mario in intimate moments with his personal trainer mistress, Kasey Dexter, leading to the reality star filing for divorce from him in 2014, the NY Post reported.
The home, which the broken-up couple purchased in 1995, comes with a pool and tennis court.
Mario will retain an Upper East Side condo the couple shared and is expected to put it on the market for $4.95 million, the paper reported.
As RadarOnline.com previously reported, the two had been fighting tooth-and-nail over their real estate, with a source telling us that "Ramona earned all the money that bought both homes," adding that "the home she bought in Southampton, she bought with premarital funds of her own."