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Tech Firm Inks Big Midtown South Expansion

NEW YORK CITY-Tech tenant AppNexus will grow its space by about 130,000 square feet in what was Mark Ecko's headquarters.

By Rayna Katz | Updated on April 09, 2013

NEW YORK CITY-Colliers International announced Tuesday it has completed a long-term, 220,000-square-foot expansion and extension for AppNexus at 28 & 40 W. 23rd St. The building owners have spent the last several years reinventing the asset from Marc Ecko’s former headquarters into a state-of-the-art destination for digital, technology, and creative firms, with AppNexus as the new anchor tenant.

AppNexus began its operations at 28 & 40 W. 23rd with an initial 24,500 square feet less than three years ago. The firm, expanded the complex in multiple stages to 90,000 square feet. With this latest round of leasing, AppNexus will now occupy approximately 220,000 square feet.

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