Commercial Office cost segregation in Illinois.

Why commercial office buildings reclassify well in Illinois

Illinois centers on Chicago — one of the largest U.S. industrial and multifamily markets. High state income tax rates make federal cost segregation deductions particularly valuable.

Commercial Office properties have a particular profile that makes cost segregation especially valuable: Class A through medical office — partitions, dedicated electrical, finishes, parking. The shell sits on a 39-year recovery period under MACRS — but every commercial office is hundreds of components, many of which qualify for 5-, 7-, or 15-year recovery and accelerated bonus depreciation.

Typical reclassification ratio

For a commercial office in Illinois, TDA studies typically reclassify 18–25% of depreciable basis. Combined with 100% OBBBA bonus depreciation on property acquired and placed in service after January 19, 2025, that translates the entire reclassified amount into a year-one deduction.

Illinois markets we serve

We deliver commercial office cost segregation studies across Illinois, including Chicago, Aurora, Naperville, Joliet, Rockford. Engineering-based methodology and RSMeans cost data on every engagement.