Firms moving to One Vanderbilt worry about observation deck

Some of the financial firms eyeing a move to the $3.1 billion One Vanderbilt may be having mixed emotions over the impact of the observation deck planned for floors close to the twisty top of the 1,301-foot-high skyscraper.

While tourists and New Yorkers alike love to gawk at killer views made available to the masses from such decks, the C-suite occupants of the building seem to be worried the extra visitors could interfere with their own employees.

Let’s recall that so far, 30 Hudson Yards having an observation deck hasn’t deterred Time Warner or other large office tenants from taking dibs at the far West Side building, or concerned tenants at the Big Apple’s observatory champ, the Empire State Building — or at Rockefeller Center.

And remember, the 1.7-million-square-foot One Vandy sits next to one of the world’s greatest transportation hubs on East 42nd Street, which already counts 19.2 million annual visitors.

SL Green is also installing $220 million in transit improvements at One Vandy that will include a block-long dedicated pedestrian area on Vanderbilt Avenue, an underground concourse to create East Side access for 65,000 Long Island Rail Road passengers and a huge waiting room under its base.

That makes the thought of execs turning their noses up at a projected 1.8 million yearly observatory goers almost laughable — after all, the location is literally at Grand Central Terminal and the observatory will be accessed from an underground passage through one of its main concourses.

Sources tell me that developer SL Green Realty Corp. and its partners, the National Pension Service of Korea and Hines, proposed — perhaps in jest — that the concerned firms simply make up the observatory’s projected $42 million in net revenue (from $77 million in gross proceeds) and they will boot the observatory.

“That is 1,000 percent not true. They are committed to building the observatory,” a spokeswoman for SL Green said.

“This is a laughable premise,” she added. “World-class observatories have helped establish New York’s most iconic addresses and attract top tenants — in fact, every potential tenant we talk to loves it.”