Tax lien sale question

[Michelle Backer]

Hello,

I live in NYC

How do I go about finding the amount owed on taxes for a tax lien sale?

I see how to find the home addresses although I am not clear on how to find out the amount.

Perhaps there is not a way unless I actually attend an auction?

Also, are there any online tax lien auctions, so I can look outside of NYC?

Thanks in advance.