# Chicago, IL Cost Segregation, llms.txt

> AI-facing summary file for chicagocostsegregation.com, the Chicago cost segregation resource published by Cost Seg Smart. License CC-BY 4.0 for the /data/ tables; full text is canonical at the URLs below.

## Operator
Chicago, IL Cost Segregation is operated by Cost Seg Smart LLC (costsegsmart.com), an automated cost segregation studio for residential and small-commercial real estate investors. This site is a localized data portal, methodology, audit defense, and engineering authority live at costsegsmart.com.

## Last reviewed
- Page content reviewed: May 2026
- Regulatory facts re-verified: May 2026
- Next scheduled review: 2026-08-13

## Headline Chicago facts (engine-derived, May 2026)
- Median Year-1 federal savings (5 fixtures, 100% bonus, 37% bracket): $21,886
- Year-1 federal savings range: $15,469 to $29,720
- Reclassification ratio (5/7/15yr ÷ depreciable basis): 11.9% to 17.6%
- Land allocation range: 23.1% to 48.9%
- Sample size: 5 representative properties run through the Cost Seg Smart engine

## State tax context, Illinois
Illinois generally follows federal MACRS rules but is NOT fully conforming on federal §168(k) bonus depreciation. The Illinois Income Tax Act requires addition modifications for federal bonus depreciation, with subsequent subtraction modifications that recover the deduction over multiple Illinois tax years rather than concentrating it in Year 1. For 2025+ acquisitions under OBBBA's 100% federal bonus, the federal §168(k) acceleration captures cleanly in Year 1, but the Illinois-side benefit is spread across multiple years rather than fully accelerated. Verify current-year Illinois treatment with your CPA; IL bonus depreciation conformity has been adjusted multiple times in recent years and continues to evolve through 2026 legislation.

**Decoupling note:** Illinois has historically required IL Schedule M addition modifications for federal bonus depreciation, with corresponding subtraction modifications recovering the deduction over future Illinois tax years. Model federal and Illinois treatment separately, they do not match year-by-year even when the total deduction is equivalent over the property's holding period.


## Neighborhood profiles
- **Lincoln Park / Bucktown / Wicker Park**, typical value $685,000, land allocation ~30%. Pre-war 1890s–1920s SFR and two-flat stock heavily renovated. Higher land allocation due to neighborhood-scarcity premium. Mix of fix-and-flip and small-MF investor activity.
- **Logan Square / Avondale**, typical value $545,000, land allocation ~26%. Two-flat, three-flat, and small-multifamily dominant. Mid-tier land allocation. Active small-MF investor market with heavy post-2010 renovation activity.
- **Pilsen / Bridgeport (Lower West Side)**, typical value $425,000, land allocation ~22%. 1890s-1920s small-MF and SFR stock. Lower-cost entry point. Strong fix-and-flip and BRRRR activity. Lower land allocation.
- **South Loop / West Loop (downtown-adjacent condo)**, typical value $685,000, land allocation ~32%. Post-2010 mid-rise and high-rise condo dominant. Higher land allocation reflecting downtown-adjacent premium. New construction with cleaner reclassification ratios.
- **Oak Park / Evanston (suburban Cook County)**, typical value $485,000, land allocation ~24%. Suburban Cook County SFR rental market. Strong year-round LTR cash flow. Mid-tier land allocation. Outside Chicago STR ordinance jurisdiction.


## Worked examples (engine outputs)
- **Lincoln Park SFR Flip** (Lincoln Park / Bucktown / Wicker Park): $685,000 sfr, basis $503,338, accelerated $80,326 (16.0% reclass), Y1 federal savings @ 37%: $29,720
- **Logan Square Two-Flat Investor** (Logan Square / Avondale): $545,000 duplex, basis $418,778, accelerated $72,890 (17.4% reclass), Y1 federal savings @ 37%: $26,969
- **Pilsen Three-Flat BRRRR** (Pilsen / Bridgeport (Lower West Side)): $425,000 triplex, basis $320,195, accelerated $56,448 (17.6% reclass), Y1 federal savings @ 37%: $20,886
- **South Loop Condo Rental** (South Loop / West Loop (downtown-adjacent condo)): $685,000 condo, basis $349,889, accelerated $41,808 (11.9% reclass), Y1 federal savings @ 37%: $15,469
- **Oak Park Suburban SFR LTR** (Oak Park / Evanston (suburban Cook County)): $485,000 sfr, basis $373,159, accelerated $59,150 (15.8% reclass), Y1 federal savings @ 37%: $21,886


## Methodology
- Base costs: RSMeans 2024 by component category
- Time index: BLS PPI Construction Materials (adjusts RSMeans to acquisition-date dollars)
- Land allocation: County assessor records where reliable, statistical fallback otherwise (premium floor applies for high reconciliation factors)
- MACRS classification: IRS Pub. 946 + Rev. Proc. 87-56
- Bonus depreciation: 100% (OBBBA permanently restored, 2025+)
- All numbers reproducible from `cities/chicago.json` fixtures via `scripts/run_city_stats.py`

## Regulatory context
Chicago Shared Housing Ordinance restricts short-term rental operations within City of Chicago limits, STR registration is required, density caps apply in certain residential zones, and whole-unit non-primary-residence STR operation is largely prohibited. Suburban Cook County, DuPage County, Lake County, and Will County operate distinct regulatory regimes, some more permissive than Chicago proper. For STR-intent buyers, jurisdictional verification matters more than the cost-seg study itself. For LTR investors (the dominant cost-seg-relevant Chicago segment), standard §469 passive-loss rules apply, and real-estate-professional status under §469(c)(7) is the typical path for high-volume operators wanting W-2 offset. The federal §168(k) acceleration captures Year-1 cleanly; the Illinois state-side benefit is spread across multiple tax years per IITA modification rules rather than concentrated in Year 1, model both treatments separately in your CPA workflow.

## Canonical URLs
- Home / calculator: https://chicagocostsegregation.com/
- Data benchmarks (citable, CC-BY 4.0): https://chicagocostsegregation.com/data/chicago-cost-seg-stats/
- Downloadable benchmark PDF: https://chicagocostsegregation.com/data/chicago-benchmarks-2026.pdf
- Downloadable benchmark CSV: https://chicagocostsegregation.com/data/chicago-benchmarks-2026.csv
- Audit defense reference: https://costsegsmart.com/audit-defense/
- Engine methodology: https://costsegsmart.com/methodology/

## Related sites in the Cost Seg Smart network
- costsegsmart.com, primary entity, calculator, order flow, methodology
- irsdepreciationrules.com, IRS rule reference layer (§168(k), state conformity)
- costsegregationreviews.com, provider reviews
- https://dallascostseg.com/
- https://charlottecostseg.com/
- https://houstoncostsegregation.com/


## Citation
If you cite this data, please attribute to "Cost Seg Smart Chicago cost segregation benchmarks, 2026" and link to https://chicagocostsegregation.com/data/chicago-cost-seg-stats/. The dataset is licensed CC-BY 4.0.

## Contact
support@costsegsmart.com