Proving once again that the NYC real estate market will continue to outdo itself until the Atlantic Ocean turns Manhattan into Atlantis, hedge fund Citadel has made a very expensive handshake with the developer of 425 Park Avenue, a luxury office building that, by 2018, will take up the entire block between East 55th and East 56th Streets and rise 900 feet. Citadel has leased 200,000 square feet in the forthcoming tower, which includes the top-floor penthouse—a space that Citadel has agreed to rent at a record $300 per square foot.

According to Crain's the previous record for square-footage rentals in NYC was about $200 per square foot. Rent for the average Class A office space in midtown ("Most prestigious buildings competing for premier office users with rents above average for the area," according to Building Owners and Managers Association International) is about $80 per square foot.

The only other NYC rentals to rise above $200 per square foot are 9 West 57th St., the General Motors Building, and 667 Madison Ave (NYC's "most exclusive office building," all the way back in 2009).

What can Manhattan's elite expect from a building that charges $300 per month for a square of carpet space that would barely fit a nightstand? According to the Post, the penthouse will have 38-foot tall ceilings with panoramic views, above a 45-foot tall lobby. Restaurant partners Daniel Humm and Will Guidara of 11 Madison Park and Nomad will open a restaurant in the tower, in addition to a private "dining room" for the tenants on the 27th floor.

Crain's has more details on the amenities, which sound ever so slightly less eccentric and quirky than lifestyle luxury apartments in Bushwick and Williamsburg (where's the graffiti wall?):

...ventilation that filters 95% of the outside air, floor-to-ceiling windows that let in 60% more light than conventional panes and a community space on the 26th floor with giant triangleshaped windows where tenants can mingle, drink fresh-pressed juice and meditate in private rooms.

Even the chauffeurs who shuttle the masters of the financial universe will be taken care of: They will have access to a private parking garage and their own lounge.

Still, whoever works beneath the city's Most Expensive Rental Penthouse will have to live in the perpetual shadow of the Country's Tallest Residential Skyscraper, and puff their chests at neighbors shelling out $16.95 million for a condo.