Duplex At 740 Park Ave Trades For $38M

An apartment in an Upper East Side co-op — dubbed New York City’s “richest building” — just traded for a rich premium.

A duplex at 740 Park Avenue sold in an off-market deal for $38 million, up from the $20.5 million the seller paid for it in 2019, according to public records. The identities of both the buyer and the seller are shielded by shell companies.

The price increase is likely due to a renovation, though the extent of the upgrade is unclear.

Construction work at the apartment was referenced in a 2019 lawsuit over an alleged injury caused by construction in the unit, at the time owned by the seller, an entity known as the E71 Trust. Court documents show the proposed work on the apartment was estimated to cost betwee $6 million and $6.5 million.

The trust purchased Unit 4/5D from investor Peter Huang, who bought it in the 1970s. Huang sought to offload the apartment for just under $30 million in 2013, though it took six years and several price cuts to finally sell.

The apartment spans roughly 7,500 square feet, according to a StreetEasy listing, which was pulled from the portal in 2018. At the time, the apartment had five bedrooms, five bathrooms and three wood-burning fireplaces. It also featured a dining room, chef’s kitchen and private elevator landing.

The deal for the duplex follows other recent high-profile trades at the Rosario Candela-designed building, known for housing members of the country’s wealthiest and most prominent families, including John D. Rockefeller Jr. and Jackie Kennedy Onassis.

Julia Koch, socialite and billionaire widow of David Koch, sold her 18-room apartment in February 2025 to hedge funder Ken Griffin for $45 million. Four months later, developer Thomas Brodsky, a partner at the Brodsky Organization, bought a five-bedroom unit at the building for $15 million.