Our belief is simple…

Business owners shouldn’t feel overwhelmed by the process of finding and closing on a new office space.

That’s why we provide our clients with unbiased advice, up-to-the-minute market information and aggressive representation in all negotiations.

Our loyalty lies with you, our clients; we never represent landlords or developers. This approach, combined with our extensive experience, proven expertise and dedication to client service, sets us apart from other brokerages.


David A. Ven Horst and Thomas G. Koelzer founded Tenant Advisors Inc. in April 2004. They set out to give tenants a powerful advocate, a voice, during leasing negotiations, through expert representation and unparalleled industry knowledge. Today, Tenant Advisors is known as a tenant-advocacy leader in the Chicago commercial real estate market.

David and Tom began their real estate careers in 1986, working their way up to First Vice Presidents of CB Richard Ellis. Together they have a combined 64 years of commercial real estate experience, closing over 1,300 lease and sale deals and amassing a wealth of industry knowledge and connections along the way.

As a company Tenant Advisors is known for their team of experts and their impressive track record of satisfied clients, representing companies both big and small.

As business owners, David and Tom are known for getting the job done and getting it done right.

David attended the University of Illinois at Urbana-Champaign and graduated with a degree in Accountancy. He received his CPA designation in 1983 and has been working in commercial real estate since 1986 and has been a Partner at Tenant Advisors since 2004.

When David isn’t in the office, he enjoys playing golf, vacationing with his wife Barbara and spending time with his three children, Kate, Alex, and Jack.

Tom attended the University of Michigan, Ann Arbor, and graduated with a degree in Business Administration. Tom has worked in commercial real estate since 1986 and has been a Partner at Tenant Advisors since 2004.

Outside of the office, Tom enjoys golfing, camping and spending time with his with his wife, Julie, and their two sons, Tommy and Michael.