Free API or csv's for historical residential real estate data?

Hi, I'm trying to start a data viz project to learn from , but having a hard time finding sources. I applied to the Zillow/Bridge API but got rejected. Not sure if RapidAPI is a good site to use? It seems I can get access to Realtor.com or Zillow through them, but at only 500 or 45 calls per month, respectively. I also found an excellent dataset from the state of CT that goes back 20 years, but would love …

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