Robert F. Kennedy’s former East River co-op has sold for $1.99 million, marking the first time the residence has been on the market in more than half a century. The sale followed a bidding war for the three-bedroom, three-bath apartment located at 870 United Nations Plaza.

The unit, which was the official residence of the late Democratic presidential candidate when he served as a New York Senator, retains original details from the mid-century era. Kennedy purchased the co-op in 1965, shortly before the building’s completion in 1966. During that period, his wife Ethel and their children resided at the family’s farm, Hickory Hill, in McLean, Virginia.

The 2,000-square-foot apartment, situated on the 14th floor, was initially listed last fall for $1.79 million. A bidding war ensued, leading to a contract signed above the asking price at $1.99 million. However, that deal eventually fell through, and the property was relisted this past spring at the same price, according to listing broker Mary Barbrack of Compass.

The apartment is described as a model of late midcentury-modern architecture. It features 48 feet of floor-to-ceiling windows offering views of the UN garden. Original kitchen appliances, an oven, and marble baths from 1966 remain in place. The layout includes a foyer, a corner living area, a galley kitchen with an eating nook, and a main bedroom overlooking the UN and the East River.

The building at 870 United Nations Plaza, along with its twin at 860 UN Plaza, was designed by Wallace K. Harrison and Max Abramovitz, architects also known for their work on the United Nations complex and Lincoln Center. The towers are characterized by their bronze-and-glass curtain walls and soaring, double-height lobbies. Building amenities include a concierge, doorman, gym, lounge, and a roof deck with panoramic views.