I am certainly no expert in anything tax related but I agree with Hammersklavier that we need more of a Land Value Tax (LVT) that taxes the value of the land (which has nothing to do with the owner but instead is a product of the community's strength or weakness) rather than the improvements. Doing so would only incentivize more development. PA actually permits LVT (see article below) and this has had success in smaller cities like Allentown and Harrisburg:
https://www.strongtowns.org/journal/...tax-experiment
I think Philly moved towards more of a tax on the land rather than the buildings on the land (improvements) a few years ago but it is not nearly enough. Hopefully as the city gets better at assessments (if there is one thing big data can help I think this is it) we will see a shift towards an LVT.