NYC.Gov

  Now the NYC Department of Finance has compiled all the past sales for the five boroughs with records going back to 2003.   You can find out what your neighbors paid and much more.  You will have to do some scrolling through but the information is up to date. 

Other things that you can do on the NYC.Gov Site is:

Search for Parking Tickets
Check your rebate status
Locate Towed Vehicles
Access EZ Fleet Online
ACRIS - Property Records
View Assessment Roll
Water & Sewer History
More...