Funds managed by Blackstone鈥檚 real estate arm have acquired a 46% stake in a $1.4bn (鈧1.2bn) New York City office asset owned by US property group Fisher Brothers.

The Blackstone funds and Fisher Brothers will own the 1345 Avenue of the Americas building as part of a partnership that has also completed an $850m commercial mortgage-backed securities (CMBS) refinancing for the Midtown Manhattan building through Morgan Stanley, JP Morgan Chase and Citibank.

The 50-storey 2m sqft 1345 Avenue of the Americas asset is currently 92% leased.

David Levine, co-head of Americas acquisitions for Blackstone Real Estate, said: 鈥淢idtown Manhattan is the best-performing office market in the country and we are excited to partner with Fisher Brothers in this trophy asset investment.鈥

Winston Fisher, partner at Fisher Brothers, said: 鈥淭his transaction reflects the tremendous value that premier, highly-amenitised office buildings continue to offer to leading institutional investors, such as Blackstone. The completion of the $850m refinancing package enables us to continue to strategically invest in the asset, while simultaneously increasing our ownership stake in the building.

鈥淲e remain bullish on the long-term Manhattan investment opportunity, which has been the hallmark of our family鈥檚 business for more than a century.鈥

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