Blackstone, the world's largest private equity firm, is searching to anchor a major new headquarters tower somewhere in the Park Ave. corridor. But there's a catch - they don't need the space until 2034, so likely too late for 175 Park.
"A person with knowledge of the investment firm's real-estate decision-making said that in the long term, it's considering a deal to potentially anchor a new office tower. Peers in the financial industry have sought such state-of-the-art spaces nearby, including JPMorgan, which is building a soaring new headquarters tower at 270 Park Avenue."
https://www.businessinsider.com/blac...-growth-2024-6
I think Blackstone builds a new supertall further north on Park, replacing one of the current mid-century towers. They would need a giant space, likely over 2 million square feet. They currently occupy 1.4 million square feet in the neighborhood, but are fast-growing.