Energy Firm Takes Full Floor at One World Trade Center

April 29, 2026

Brokerage New York News Northeast More Office

This is the tenant’s fourth expansion at the tallest building in the Western Hemisphere.

One World Trade Center tower in NYC — One World Trade Center. *Image courtesy of Dees Stribling*

Energy Capital Partners, an energy infrastructure-focused investor, has expanded at One World Trade Center in Manhattan to occupy the entire 59th floor. With the tenant’s existing space on the floor below, ECP now occupies 70,425 square feet of the building, according to the Durst Organization and the Port Authority of New York and New Jersey.

The expansion is the fourth at the building for ECP. The company originally leased 6,173 square feet in 2017, about three years after the building was completed, and later upped that total. ECP Managing Partner & Chief Operating Officer Murray Karp cites in a statement the commute for ECP employees, building amenities, and views as reasons for increasing its footprint.

Other tenants at the building include Condé Nast Publications, Carta, Ameriprise, Celonis, Stagwell, Scale AI and Frier Levitt. The building is 97 percent leased, reflecting strong office space trends in Manhattan.

Built by the Port Authority and the Durst Organization in a public-private partnership, the 3.1 million-square-foot One World Trade Center is the tallest building in the Western Hemisphere, and the main building of the rebuilt World Trade Center complex after the site’s destruction in 2001.

The 25,000-square-foot Well& by Durst amenity space on the 64th floor Sky Lobby provides tenants with seasonal meals, curated events, as well as meeting, event and lounge spaces. The building is LEED Gold certified and has direct access to the World Trade Center Oculus transit hub.

The Durst Organization was represented in-house in the ECP deal by Senior VP of Commercial Leasing Eric Engelhardt, Managing Director of Commercial Leasing Karen Rose and Associate Director of Commercial Leasing Sayo Kamara, and by Newmark’s President of the New York Tri-State Region David Falk, Vice Chairmen Peter Shimkin and Hal Stein, Director Nathan Kropp and Associate Paige Raisides. Executive Managing Director Eric Zemachson and Managing Director Corey Borg from Newmark represented ECP in the lease.

Manhattan Office Market Hot

Companies want to be in Manhattan. That office market has the lowest vacancy among major U.S. markets, according to Yardi Matrix data, standing at 13.6 percent at the end of 2025, well below the national rate of 18.4 percent and 300 basis points down from a year earlier.

Leasing activity in the market was particularly strong toward the end of last year. Moody’s Corp. took 460,000 square feet at Brookfield Properties-owned 200 Liberty St. in Lower Manhattan, where it will move its global headquarters in 2027.

As of December, 2.7 million square feet of new office space were underway in Manhattan, Yardi Matrix reported. The market came in second in that metric after Boston, where 5.4 million square feet were under development.