Most Useful Datasets For Analyzing Residential Real Estate Sales

I’m looking for the most useful datasets for analyzing residential real estate sales to help determine property values. Ideally, I’d like datasets that include:

• Historical sales prices
• Property characteristics (square footage, lot size, bedrooms/bathrooms, etc.)
• Location data (ZIP code, neighborhood, proximity to amenities)
• Market trends (price appreciation, days on market, supply/demand)
• Tax assessments and mortgage data (if available)

I’m especially interested in open/public datasets but would also appreciate recommendations on high-quality paid sources. Bonus points for datasets that provide nationwide coverage in the U.S. or strong local-level granularity (county or ZIP code level).