Stellwagen was the president of the Thomas J. Fisher Companies, a real estate and mortgage brokerage closely affiliated with Senator Francis G. Newlands, and the company was in part organized to act as the fiduciary for investment by Williams Deacon's Bank to the Chevy Chase Land Company, one of the investments Newlands managed on behalf of his the descendants of his father-in-law, William Sharon.

[3] Tenants have included the American Planning and Civic Association and Covington & Burling, which had its offices in the Old Union Trust Building in 1940, when Gerhard Gesell joined the firm (according to his 1984 unpublished memoir).

In 1906 Waddy Butler Wood of Wood, Donn & Deming became the first Washington, D.C. architectural firm to design a bank high-rise in their city when they designed the Union Trust Building.

The building is faced in Mount Airy granite, with bronze and glass details.

[1] Media related to Union Trust Building (Washington, D.C.) at Wikimedia Commons