Bryan,
I'm sure you already know this but here are some ideas I have come up with. First off, why go through a broker? I just hate that you would have to pay a broker's fee which if passed on to the bank would ultimately be passed back on to you either through interest rate or an origination fee of some sort. As a banker I hated dealing with brokers. As an investor it may make more sense when the flow of credit dries up. So if this is the route you want to take here are some ideas.
1. Lifestyles Unlimited. I am a member and I have met many brokers here in San Antonio. I am sure there are plenty in Austin and I believe Austin has a Lifestyles chapter.
2. Talk to lenders and see if they recommend anyone. A good lender will refer you to someone if they can't get the deal done. I know I did.
3. Talk to investors. This may seem obvious, but there may be a real estate investor out there who has someone in mind.
4. Talk with Commercial Real Estate brokers. They will more than likely have a guy they send deals to.
5. SBA lenders at a community bank. The Small Business Administration does not do non-owner occupied commercial real estate loans, however, there are SBA lenders who like to deal with brokers because they keep deals flowing through and it is easier to pass the fees off to the customer. For example, I once saw on a Credit Report review fee for $1,000 on a Summary of Fees transcript. So be careful when you get an SBA loan!
Hope this helps man.