Where do zillow and redfin get their sale data?

recently “sold” in SF for dirt cheap:

edit: new link: https://www.redfin.com/city/17151/CA/San-Francisco/filter/max-price=500k,include=sold-2yr,viewport=37.81246:37.73037:-122.3764:-122.49999

ā€‹

Where is this data coming from? I don’t understand how anything in SF sells for less than 500K.

submitted by /u/pensivebeing
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