Si Newhouse is going to need a bigger cafeteria.
The magazine titan’s glam-magazine house Condé Nast is expanding big-time at 1 World Trade Center — even before the iconic tower is finished.
The publisher of Vanity Fair and Vogue, among other glossy titles, plans to take an additional 133,000 square feet — on top, literally, of the 1.05 million square feet he signed for in the rising skyscraper last year, sources told The Post.
Condé and 1 WTC’s owners, the Port Authority and the Durst Organization, are expected to soon finalize a deal for floors 42-44 in the 104-story project. The earlier lease is for lower floors.
“They had an expansion option and they just told the Port and Durst on that they intend to go ahead with it,” a source said.
Terms were not available. The original, 25-year lease was estimated to be worth $2 billion.
The Condé expansion, once finalized, might prove to be one of the young year’s largest office leases, as deals have slowed considerably since mid-2010.
Condé Nast’s growth will mean that 1.37 million square feet of 1 WTC’s total 3.05 million square feet will be taken by private-sector companies including 190,810 square feet for Vantone Industrial Co.’s China Center New York.
In addition, the US General Services Administration is wrapping up final points of a 300,000 square-foot lease on floors 50-56. The feds were originally to take 600,000 square feet, but the PA and Durst wanted to make more floors available to higher-paying non-government tenants.
The tower is scheduled for occupancy in mid-late 2014, when Condé Nast will leave its longtime home uptown in Durst’s 4 Times Square.
No one involved in the expansion deal would comment or return calls.
Condé Nast is represented by CBRE’s Mary Ann Tighe and the PA and Durst by Cushman & Wakefield’s Tara Stacom.