[5] In 1988 Steir joined Julien J. Studley Inc and has since been the firm's top-producing broker nationwide, closing more than 60 million square feet in leases over his career.
In 2003, Steir led a management buyout of the company from Julien J. Studley and became chief executive officer.
[16] Steir’s clients include Time Warner,[17][18] Ralph Lauren,[19] Tiffany & Co.[20]., Accenture, Kirkland & Ellis,[21] Jones Day,[22] WilmerHale, Credit Agricole,[23] Winston & Strawn and Wachtell, Lipton, Rosen & Katz[24] among others.
[25] He also negotiated the largest transaction of 2000 in midtown New York, 1,000,000 square feet (93,000 m2) for the headquarters of AOL Time Warner[15] at Columbus Circle.
Steir is a member of the American Israel Public Affairs Committee (AIPAC) Real Estate Division Executive Council.