Issue 6 opened this as a reference feature previewing the fall appeal calendar. September is the natural point to update and republish it as the actual operative calendar rather than a preview, now that several deadlines it flagged are imminent rather than months out. Allegheny County's appeal deadline moved to October 1 - a month away as this issue publishes. Lackawanna County's first reassessment in six decades certifies November 14. Cook County's township-by-township windows, tracked since Issue 3, continue rolling through the fall. This piece consolidates all three into a single actionable reference for property owners and district managers with parcels across multiple jurisdictions.

Allegheny County is the most time-sensitive. The deadline moved to October 1, and a moved deadline is the most common cause of a missed appeal. Property owners who confirmed the date last year and assume it carried forward are the ones most at risk; the county changed the date, and prior-year practice is no longer a reliable guide. With 30 days remaining as this issue publishes, a September-reading owner still has meaningful time to file, but not much room for delay. The evidence file - rent roll, operating statements, comparable leases, and where an anchor has departed, the vacancy timeline - should be assembled now, not in the final week.

Lackawanna County is the more structurally significant deadline. The first countywide reassessment in nearly six decades certifies November 14, meaning new values become effective for 2026 tax bills. Property owners here are facing a valuation reset with essentially no recent comparable cycle to anchor expectations - a more extreme version of the "first revaluation since before the pandemic" pattern this publication documented in North Carolina and New Castle County, Delaware. Formal appeal hearings began August 4 and run through October. Rates fall as values rise to keep the process revenue-neutral for taxing bodies, but rates are not set until after November 14 certification, meaning owners appeal a value without knowing the rate. That is the inherent difficulty of a reassessment-year appeal: the owner is contesting a number whose tax consequence is not yet fixed.

Cook County's rolling township windows continue through the fall. South and west suburbs are under reassessment in 2026; properties in the north suburbs and the City of Chicago are reassessed only on division work, permits, or special circumstances, but owners in non-reassessment townships can still appeal when their township opens. The township-specific deadlines are posted when each township opens, which means the calendar is not a single date but a series of dates that require active monitoring. Owners with parcels across multiple Cook County townships should track each township's opening separately rather than relying on a single countywide deadline.

Across all three jurisdictions, the same practices apply. Calendar the deadline from the notice date, not from memory. Build the evidence file before filing, not after. And where an anchor pharmacy or big-box space has gone dark, the income approach is the argument - but it requires property-specific evidence, not a market narrative, especially given that national shopping center vacancy has run near cyclical lows on historically low construction deliveries, which cuts against an owner arguing a broadly distressed re-tenanting environment.

Source: Issue 6 MB feature and platcards; Allegheny County and Lackawanna County coverage, Issue 6; Cook County Assessor assessment and appeal calendar.