NYC's Dept of Finance current website exposes data from 2009-2015 at http://webapps.nyc.gov:8084/CICS/fin1/find001I.
DOF shared detailed historical data with RPA for 2000 - 2009 as part of a study of property values in Manhattan and near Hudson River Park. This dataset is helpful for capturing trends around assessed real estate values and estimated tax contributions, as well as changes that occur at a building level.
This data covers all of New York City and is shared in a bulk Access format as a community resource, though it could benefit from some additional refining into other data products.
Format: Microsoft Access