Dan Loeb’s Third Point hedge fund has finally inked its lease for 75,064 square feet at 55 Hudson Yards.

Additionally, Mount Sinai Medical Center is cutting a deal for a concierge medical facility to be located on the second floor of the tower.

We hear Jeff Blau, the CEO of the building’s developer, Related Cos., is a board member of the hospital and is facilitating this transaction. This is expected to be an exclusive place that will provide medical services for just those who live and work at Hudson Yards.

Meanwhile, Third Point will perch on the top three floors of the 780-foot tall tower. Under the 10-year lease it will have the entire 50 and 51st floors and half of the 49th floor. There are also future expansion options, sources said.

The building is majority owned by Mitsui Fudosan in a venture with Hudson Yards developers: The Related Cos. and Oxford Properties.

Alexander Chudnoff and Dan Turkewitz led the JLL team represented Third Point. Howard Fiddle, Bob Alexander, and Emily Jones of CBRE negotiated for the building ownership while Stephen Winter, Andrew Cantor and Jordan Bargas represented Related in-house.

Sources said the asking rents had been $130 to $140 per square foot but now any remaining space that is not subject to expansions has a tab of $150 per foot.

The 1.3 million square-foot office building designed by Kohn Pedersen Fox along with Kevin Roche is due to open in 2018.

Third Point, a high-profile company led by the activist investor, has over $18 billion under management. It is currently located at Lever House at 390 Park Ave. and will join a bevy of tenants that will be exiting mostly Midtown towers for the westward ho march to Hudson Yards.

Tenants already committed to just 55 Hudson Yards include: Steven A. Cohen’s Point 72 Asset Management; Silver Lake Partners; MarketAxess; and, Intercept Pharmaceuticals — plus the law firms Cooley, Milbank Tweed Hadley & McCoy, and Boies Schiller Flexner.