What is SIOR? And Why Does It Matter When Choosing a Commercial Real Estate Broker?
If you see “SIOR” after a commercial real estate broker’s name, what does it actually tell you?
SIOR stands for Society of Industrial and Office Realtors. It is a professional organization for commercial real estate practitioners. The SIOR designation is awarded to brokers who meet experience, production, education and ethical standards. Both myself and Bryant Meyer of Oakbrook Corporation have this prestigious designation, among just five total designees in the Madison market.
For a property owner or tenant, it can be a useful screen because earning the designation requires a demonstrated transaction history.
A Production-Based Credential
SIOR applicants in the U.S., Canada and Mexico generally need at least five years of active commercial real estate experience. They also have to demonstrate sustained production over a multi-year qualifying period, measured by gross fee income and transaction activity.
The thresholds vary by market. Qualifying is not based on one unusually strong year. Applicants have to show sustained production over multiple years.
The specialty also matters. Industrial and Office designees qualify within those property types. A dual Industrial and Office specialist has to meet production requirements across both specialties.
I earned the dual Industrial and Office SIOR designation in 2008. My colleague Bryant Meyer earned the Industrial SIOR designation in 2026. Having gone through the process, I consider the production requirement a meaningful hurdle. You have to show that you have consistently been doing the work.
A Network We Actually Use
SIOR has more than 4,100 members in 52 countries. I have used that network many times for clients.
A Madison company may need to lease a facility in another state. An owner may have a property to sell outside Wisconsin. SIOR provides a network for finding brokers with relevant experience in those markets.
It works in reverse, too. SIOR brokers around the country regularly contact us when their clients need help in Madison.
For a client, that can shorten the search for the right local advisor and provide access to market knowledge and relationships that would otherwise take time to develop.
Continuing Education
SIOR also offers conferences, courses and continuing education.
I have found the conferences especially valuable. Brokerage practices, negotiation strategies, technology, capital markets and client expectations keep changing. Spending time with experienced industrial and office brokers from other markets gives me ideas and perspective that I can bring back to clients in Madison.
What Should a Client Take From SIOR?
When selecting a commercial real estate broker, I would still look closely at local experience, property-type specialization, transaction history, market knowledge and whether the broker has handled assignments similar to yours.
SIOR adds another useful screen. It documents sustained production and experience in industrial or office real estate, and it gives the broker access to a national and international network and ongoing education.
Those are practical benefits when the assignment involves a significant real estate decision.
Learn more: Why Hire an SIOR?
FAQ
What does SIOR stand for?
SIOR stands for Society of Industrial and Office Realtors.
How do you become an SIOR?
Applicants generally need at least five years of active commercial real estate experience and must meet production, transaction, education and ethics requirements. Production thresholds vary by market.
What is a dual SIOR designation?
dual designee qualifies in both industrial and office real estate rather than a single specialty. Dual applicants have production requirements across both property types.
How many SIOR members are there?
SIOR reported more than 4,100 members in 52 countries in its 2025 annual report. There are just five SIOR’s based in the Madison area, with two at Oakbrook Corporation.
Should I hire an SIOR broker?
SIOR can be one useful qualification when evaluating a broker. Also look at the broker’s experience in your market, specialization, recent transactions and experience with properties or assignments similar to yours.
Chris Caulum, SIOR
Vice President of Commercial Brokerage
Chris specializes in industrial and office real estate throughout Madison and South-Central Wisconsin, helping owners, investors, and businesses make informed commercial real estate decisions.
608-443-1040
ccaulum@oakbrookcorp.com
Meet Chris Caulum