Once you know the name of the street where you find a house you are interested in - go to the County Tax Appraiser website and do a property search on that street - you will see whether the owner is a full-time owner or has an out-of-state mailing address. That should be your first clue that they are snowbirds and/or the house is a rental property.
Sumter County Tax Appraiser
Record Search : Sumter County Property Appraiser
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Not sure if I have free time...or if I just forgot everything I was supposed to do!