Catalyst IOS Leases 12,000 Square Feet at 800 Third
The industrial outdoor storage investment manager is doubling its Midtown East headquarters with a five-year lease on the entire 35th floor.
Updated on Nov. 3, 2026 in Commercial
Catalyst IOS has leased the entire 35th floor of 800 Third Avenue, expanding its headquarters to 12,000 square feet from 6,000 square feet on the 27th floor. The five-year lease will accommodate the firm as it grows its platform, with occupancy planned by the end of 2026.
Why it matters
The move reflects the firm's expansion, with its platform comprising over $1.4 billion in assets under management across more than 220 U.S. properties. The new space will support its 37-member team as it scales operations in New York City.
The lease covers 12,000 square feet, double the 6,000 square feet Catalyst previously occupied on the 27th floor, on a five-year term. The asking rent was not disclosed, leaving the cost of the space unconfirmed.
The players
Catalyst IOS
Catalyst IOS is an investment manager specializing in industrial outdoor storage assets across more than 220 U.S. properties.
SL Green
SL Green is one of New York City's largest office real estate investment trusts, owning and managing Manhattan commercial properties.
Cushman & Wakefield
Cushman & Wakefield is a global commercial real estate services firm that brokers leases and sales for corporate and institutional clients.
The details
Cushman & Wakefield's Harry Blair, Kyle Cohen and Kelli Berke negotiated the deal on behalf of landlord SL Green, while Catalyst was represented in-house. The building sits in Midtown East between East 49th and East 50th streets, within the Grand Central submarket.
Timeline
February 2026: Catalyst launched a $400 million equity fund.
June 2026: Catalyst secured a $281 million portfolio financing package.
Occupancy of the new space is planned for the end of 2026.
Market Landscape
Catalyst's doubling of its headquarters follows its 2026 capital raises, including a $400 million equity fund and a $281 million financing package. The expansion positions the firm to pursue further acquisitions in the industrial outdoor storage sector.
For New York City office tenants and brokers, the lease illustrates how investment managers are expanding Manhattan headquarters in Midtown East. The transaction shows leasing activity in the Grand Central submarket, where Class A asking rents averaged $82.64 per square foot in the third quarter.
The takeaway
Growing investment managers are increasingly securing larger Manhattan headquarters to support expanding teams and portfolios. Tenants comparing Midtown East options should weigh current Grand Central submarket rent benchmarks.
What happens next
Catalyst plans to take occupancy of its new 35th-floor space by the end of 2026.
Further reading
Explore more commercial real estate news covering Manhattan office leasing trends.
Source note: This article includes information reported by Commercial Observer.
