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Updated August 28, 2026

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Pennsylvania Guides

Pennsylvania overview Montgomery County, PA Chester County, PA Bucks County, PA Lehigh Valley, PA Philadelphia, PA Lancaster County, PA Monroe County, PA (the Poconos) Pike County, PA

Company

About Basis Methodology Sources & Citations Why Basis Contact Us

IRS ATG Aligned · Methodology per IRS Pub 946 & Treas. Reg. §1.168 · Engineering-based component studies · Form 3115 / 481(a) look-back · Works directly with your CPA

Basis works with commercial and short-term rental owners nationwide. Estimates run off the county's own assessment records, including a proprietary data engine covering more than 14,000 Pennsylvania commercial and industrial parcels.