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Everything I have read on CREOBA is crap. Just Google it. Looks like they are trying to replicate REO MAC and NREOBA but do it on the commercial side and charge more.
You can do much better on your own.
For a resi agent looking to get into commercial, CREOBA can provide some great training and networking. CCIM is also a great place to learn. The CCIM designation is on of the most respected designations in commercial real estate.
Many people have joined this association and expect to get listing as a result. It doesn't work that way.
I am a member and use my CREOBA membership along with my CCIM candidacy to gain credibility when speaking with banks about their assets.
Matt Mandell also offers some great training. I would Google him and see what he has going on too.