How do I find commercial properties for sale or purchase commercial real estate in the San Francisco Bay Area?

Do I need a commercial real estate broker or a commercial real estate agent? Would the agent we used to buy our condo be able to help us or do we need someone specializing in commercial real estate only?

Thanks,
Doug
Update: Thanks for the gregorygarver.com link, it was very helpful. We are probably going to buy a single tenant triple net lease. Thanks again.
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