(Be sure to read GlobeSt.com tomorrow morning for a follow-up story on the Conde Nast deal.)

NEW YORK CITY-It’s official. Publishing giant Conde Nast signed off on a landmark one-million-square-foot deal, as anchor tenant for One World Trade Center Wednesday afternoon, following a Port Authority of New York & New Jersey board meeting. The move gives the 1,776-foot tower--and Lower Manhattan--a major boost.

Cushman & Wakefield vice chairman Tara Stacom, who has overseen leasing at the building since 2007, tells GlobeSt.com that she is “very pleased,” adding that Cushman is already in talks with other diverse corporate clients, perhaps lured by Conde Nast’s stamp of approval.