The data and software used by the Office of the City Controller to perform its analysis of Philadelphia's property assessments is available for download using the links above. A full summary of our findings is available in our report, entitled "The Fairness and Accuracy of Philadelphia's Property Assessments."
Below, we provide links (the "Launch Binder" buttons) to two guides that walk through the analysis steps used by the Controller's Office. These guides are fully executable, meaning that after following the links below, each step of the analysis can be run and the results of the analysis reproduced (without installing any software on your local computer).
The guides also provide more in-depth, technical explanations for the various steps involved in the analysis.
The guides can often be slow to load – please be patient.
A sales ratio study is the industry standard for evaluating the accuracy and fairness of property assessments.
Land values for residential properties were analyzed to identify major trends and potential flaws in the valuation methodology.
For questions or comments, please contact controller.policy@phila.gov.