Catalyst IOS Doubles HQ at SL Green’s 800 Third Avenue to 12K SF – Commercial Observer
Catalyst IOS, an investment manager specializing in industrial outdoor storage (IOS), has doubled the size of its 800 Third Avenue headquarters, Commercial Observer has learned.
Catalyst’s new 12,000-square-foot office takes up the entire 35th floor of SL Green Realty’s Midtown East Manhattan tower. The company will move from its current 6,000-square-foot space on the 27th floor, according to a company spokesperson.
The deal carries a five-year term, and the asking rent was not disclosed. Asking rents for Class A offices in the Grand Central submarket averaged $82.64 per square foot in the third quarter of 2026, according to Colliers.
The move will support Catalyst’s 37-member team as it grows its platform, which currently comprises over $1.4 billion in assets under management across more than 220 U.S. properties, according to a spokesperson.
“As our network of irreplaceable IOS sites and best-in-class team continues to grow, this expanded space will help us achieve our mission of being the sector-defining company in IOS,” Max Heiden, co-founder and partner at Catalyst, said in a statement.
Catalyst reported $181 million of completed IOS acquisitions in the first half of 2026. It closed a $400 million equity fund in February — the AV- and EV-focused acquisition strategies of which it discussed with CO in March — and secured a $281 million portfolio financing package in June.
Cushman & Wakefield’s Harry Blair, Kyle Cohen and Kelli Berke negotiated the deal on behalf of SL Green, while Catalyst was represented in-house.
The firm plans to take occupancy in its new office space by the end of the year. The 526,124-square-foot building, located between East 49th and East 50th streets, also hosts financial planning company Reid Tax & Advisory Services, investment adviser Kimelman & Baird and Silicon Valley-based law firm Ropers Majeski.
A spokesperson for C&W did not respond to a request for comment.
Emily Davis can be reached at edavis@commercialobserver.com.
