Look for a platforms to research off market Commercial/Multifamil

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I came across Reonomy.com that specializes in commercial/multifamily property research. A fellow investor gave me a negative review of the site based on his experience. I've never used the site and I don't have other reference points. I'm curious if anyone has used Reonomy and what was your experience. Also, are there other sites like this out there that specialized in commercial or multifamily properties that are reputable?