Newbie looking for multifamily tools

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Newbie here in south florida... Well not entirely, have 2 single family homes with renters but have found that single family homes don't produce cash flow I need to continue investing faster. I've gotten serious about multifamilies but on the websites like realtor..com I only see about 15-20 options for all of south florida. Where is everyone else looking? Also if the deal is truly sweet, and is generating passive income for the owner, why would someone be unloading their property in the first place?