Philadelphia’s 10-year property tax abatement helped reshape the city’s housing market during more than two decades of redevelopment, according to a report from the AEI Housing Center examining construction, vacant land, property values, population growth, and city tax revenue.
The report argues that Philadelphia’s decision to expand its tax abatement in 2000 played a major role in making residential construction economically viable across areas that had struggled with decades of population loss and disinvestment.
It also raises questions about whether recent changes to the program could slow redevelopment in neighborhoods where vacant lots remain common.
Philadelphia Entered the 2000s With a Major Vacancy Problem
Philadelphia entered the new century after losing population for five consecutive decades. The city declined from approximately 2.1 million residents in 1950 to 1.5 million in 2000.
Lower housing demand contributed to abandoned properties and vacant land. The report estimates Philadelphia had roughly 36,000 vacant townhome lots in 2003, representing about 9% of the city’s townhome lots.
In 2000, Philadelphia expanded its existing tax abatement program to cover the improvement value of newly constructed and renovated residential properties for 10 years.
The goal was to encourage residential construction, strengthen the local building industry, and help Philadelphia compete with its surrounding suburbs for residents and investment.
Housing Construction Shifted Back Toward Philadelphia
The report associates the expanded abatement with a significant increase in residential development.
Between 2000 and 2023, Philadelphia added approximately 60,800 housing units across 18,300 new buildings. Smaller properties played an especially significant role. Townhome infill represented about 35% of new housing units and the overwhelming majority of newly constructed buildings.
Development initially concentrated around Center City before gradually moving outward into surrounding neighborhoods.
That pattern helped convert previously vacant parcels into housing. From 2004 through 2023, the report estimates that 17,428 vacant townhome lots were converted into properties with structures, while 11,751 existing structures became vacant lots.
The result was a net reduction of 5,677 vacant townhome lots.
By 2023, Philadelphia’s citywide townhome vacant lot rate had fallen to approximately 7.6%.
Philadelphia and Camden Followed Different Paths
One of the report’s central comparisons looks at Greater Downtown Philadelphia and Camden, New Jersey.
The researchers describe the two areas as having similar economic and housing conditions around 2000, including comparable property values, rents, incomes, housing types, and vacant lot rates.
Their trajectories then separated considerably.
Between 2003 and 2023, Greater Downtown Philadelphia’s vacant townhome lot share declined from 14.4% to 11%, while Camden’s vacant lot share increased from 15% to 23%.
From 2000 through 2023, median sales prices per square foot increased from $32 to $231 in Greater Downtown Philadelphia. Camden increased from $27 to $73.
Population also moved in opposite directions. Greater Downtown Philadelphia grew nearly 13% from 2000 through 2020, while Camden declined about 10%.
The report attributes a significant portion of that difference to Philadelphia’s tax abatement, although comparisons between two cities cannot by themselves establish that the abatement was responsible for every economic or demographic change.
The Report Challenges Common Criticism of the Abatement
The study also addresses criticism that the tax abatement primarily benefited large developers or luxury development.
According to the report, much of Philadelphia’s infill construction was performed by relatively small builders rather than a handful of major developers.
It estimates that roughly 3,000 builders and developers were responsible for approximately 11,700 infill townhomes constructed between 2000 and 2021.
The report also argues that the program’s fiscal impact should account for development that might not otherwise have occurred.
Using Greater Downtown Philadelphia and Camden as a comparison, researchers estimate average real estate tax revenue per parcel constructed in 2000 or later was approximately 56% higher than what Greater Downtown Philadelphia may have generated under a Camden-like development scenario.
The study notes that taxes continued to be collected on land during the abatement period and that the improvement became fully taxable after the abatement expired.
Philadelphia Reduced the Abatement Beginning in 2022
Philadelphia changed the residential abatement beginning in January 2022, effectively reducing its value by phasing out the exemption over the 10-year period.
The city also introduced a 1% tax on the improvement value of new residential construction.
The report argues those changes have made some smaller development projects less financially feasible, particularly in neighborhoods farther from Center City where property values are lower.
Permit data included in the study shows average permits for one-unit properties declining 48% when comparing 2015-2020 levels with 2022-2023 levels.
At the same time, the city’s development mix has shifted more heavily toward larger multifamily rental projects.
The researchers argue that this could particularly affect Council Districts 3, 4, 5, 7, and 8, where significant numbers of vacant lots remain and where infill development had begun moving before the policy changed.
Report Calls for Reconsidering Philadelphia’s Development Incentives
The report ultimately recommends restoring Philadelphia’s original 10-year residential tax abatement and even considering a longer incentive period to account for higher interest rates.
Researchers argue that future housing policy should focus on continuing to reduce vacant lots, expanding homeownership opportunities, supporting small-scale development, and increasing the city’s long-term tax base.
The report also proposes dedicating a portion of additional tax revenue generated by new development toward reducing Philadelphia’s wage tax.
Whether city policymakers agree with those recommendations remains a separate question.
The broader findings highlight the scale of Philadelphia’s transformation since 2000 and the important policy debate now facing the city: how to continue encouraging investment and housing construction while balancing affordability, tax revenue, neighborhood stability, and the needs of existing residents.