What is property tax?
The City of New York used to maintain a website maintained by the Property Assessors Dept at which you could enter a specific address e.g. "221 Park Avenue Apt 34G" and get incredible info...owner,sales price,tax assessment amount and lots of other interesting stuff.
I assume they still have it but it's possible that they don't. I've read that some cities/towns/counties that used to have them did away with them because they were being used by crooks for various kinds of fraud and robbery.