I do not have a simple calculation for you but you can always go onto http://www.NYC.gov and look up the property tax on any property in the five boroughs. It show the property tax and how it was calculated. To make it even easier for you click on this link:
If I can be of further assistance please let me know. Good luck!
Mitchell S. Feldman
Associate Broker/ Director of Sales
Madison Estates & Properties, Inc.
Office: (718) 645-1665/ Cell: (917) 805-0783
You'll need to locate the Block and Lot number first, which you can do on the same site. Once you have that you can look up the property and view the most recent tax bill.