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Discussion Paper
How Prevalent Were Racially Restrictive Covenants in 20th Century Philadelphia? A New Spatial Data Set Provides Answers
One of the tools used by early 20th century developers, builders, and white homeowners to prevent African Americans from accessing parts of the residential real estate market was the racially restrictive covenant. In this paper, we present a newly constructed spatial data set of properties in the city of Philadelphia with deeds that contained a racially restrictive covenant at any time from 1920 to 1932. To date, we have reviewed hundreds of thousands of property deeds and identified nearly 4,000 instances in which a racial covenant had been included in the deed. The covenanted properties ...
Discussion Paper
Combining AI and Established Methods for Historical Document Analysis
This paper examines methodological approaches for extracting structured data from large-scale historical document archives, comparing “hyperspecialized” versus “adaptive modular” strategies. Using 56 years of Philadelphia property deeds as a case study, we show the benefits of the adaptive modular approach leveraging optical character recognition (OCR), full-text search, and frontier large language models (LLMs) to identify deeds containing specific restrictive use language— achieving 98% precision and 90–98% recall. Our adaptive modular methodology enables analysis of ...