substantially different from the actual value) and the amount of taxes at some municipal office or other.

As far as I am aware, the deed to the property, including property boundaries, property type, property owner of record, etc, is public record. Property zoning, sales and ownership transfers, tax charges and tax payment histories (including tax amounts past due, if any) are also public record. So are any liens, assessments or violations against the property that were reported to municipal authorities. So is the information on whether the property is eligible for any tax exemptions or refunds. Not sure if foreclosure status is public record. Additional property details and features, current market value, listing status, and more, can be easily looked up on web sites like Zillow and Realtor.com.

There may be more public record stuff that I am overlooking.

It might take a bit of maze running through various municipal bureaucracies. Depending on your location, a lot of it may be available online.

Here in Michigan, each county has an elected register of deeds whose office is responsible for maintaining certain data about properties, including taxable values. Many counties post that info on their website (usually via a searchable database).

It depends on the county since some of the smaller counties simply do not have the budget to scan the records and provide online space.

Here is a place to start locating where the records you want might be in the US: https://publicrecords.netronline.com/ (some they ask for fees, but some go directly from their site to the local county records).

I find it most useful to start with the Property Appraiser's Office in the relevant county. Here, the tax and deed records are linked from those pages online.