The ownership and selling price of a parcel of property are pretty much a matter of public record throughout most (all?) of the US along with aa number of other things. Deeds are recorded with the county clerk in MA.

Some of that can be obfuscated through LLCs and trusts but some things are pretty much a matter of public record that not everyone agrees should be. More is doubtless available in some locales. I don't think property tax charges are public where I live though who knows if I asked the town clerk nicely. (Property taxes are at the town level where I live.)