TREX occupies floors one through three of the historic Lammert Building at 911 Washington Avenue, an Americanized French Renaissance Revival structure built in 1898 in the heart of Downtown St. Louis. The building is distinguished by four-story Corinthian pilasters, arched detailing, and a grand arched entryway. TREX (Technology Regional Entrepreneur Exchange) purchased and renovated the building, investing roughly $1 million to convert it into a coworking and technology incubator space, and today it is home to a vibrant community of founders, developers, and designers connected to organizations including Arch Grants, Cultivation Capital, ITEN, and SixThirty.

Five office suites are currently available for lease: Suite 170 on the first floor; Suites 200, 203, and 210 on the second floor; and Suite 312 on the third floor. Individual square footages are being finalized, but suites across the building generally range from approximately 800 to 2,500 SF, offered on a full-service gross basis so tenants avoid separate gas, electric, CAM, janitorial, and insurance charges. Every suite includes access to TREX's shared amenity package: a community/cowork lounge with complimentary coffee and evening beer, multiple bookable conference and huddle rooms, dedicated training room space for workshops and events, and vending machines throughout the building. The building is fiber-served with building-wide janitorial service included in the lease rate.

The building's exposed brick, original hardwood, and oversized historic windows preserve its character while the shared infrastructure gives tenants a turnkey, move-in-ready office without the overhead of building out their own space. Parking is public/garage-based nearby, with no dedicated on-site lot, consistent with most historic buildings in the Downtown core.

The location sits in the Downtown East submarket, walking distance to the Convention Center, restaurants, and transit, with a CoreLogic-reported Walk Score of 91 out of 100. TREX is an ideal fit for startups, small professional service firms, and satellite offices seeking flexible, amenity-rich space alongside an established St. Louis innovation community.