HPOZ Rules: Chicago vs Oak Lawn
How do hpoz rules rules compare between Chicago, IL and Oak Lawn, IL?
Chicago and Oak Lawn have similar restriction levels.
Chicago, IL
Cook County
Chicago does not use the HPOZ model. The Commission on Chicago Landmarks designates individual landmarks and landmark districts under MCC 2-120, regulating exterior alterations, demolition, and new construction within district boundaries through a permit review process.
View full Chicago rules →Oak Lawn, IL
Cook County
Cook County does not use Los Angeles-style Historic Preservation Overlay Zones. Instead, Cook County Historic Preservation Ordinance Chapter 102 Article VI establishes Historic Districts and Landmarks for unincorporated areas, while suburbs designate their own districts under Illinois home-rule authority.
View full Oak Lawn rules →Key Facts Comparison
| Fact | Chicago | Oak Lawn |
|---|---|---|
| Authority | MCC 2-120 Landmarks Ordinance | - |
| Reviewing body | Commission on Chicago Landmarks | Historic Preservation Commission |
| Number of districts | Approximately 60 districts | - |
| Review trigger | Any visible exterior work | - |
| Tax incentive | Class L assessment freeze | - |
| Code | - | Cook Co Ch. 102 Art. VI |
| Required document | - | Certificate of Appropriateness |
| Coverage | - | Unincorporated Cook only |
Highlighted rows indicate differences between cities.
Chicago FAQ
Does Chicago have HPOZs like Los Angeles?
No. Chicago uses landmark districts under MCC 2-120 instead. The function is similar but review goes through one citywide Commission on Chicago Landmarks rather than per-district preservation boards.
What work needs Commission review?
Any exterior alteration, addition, demolition, or new construction visible from a public way that requires a building permit. Interior changes and in-kind maintenance using identical materials typically do not require review.
Oak Lawn FAQ
Does Cook County have HPOZ overlays like Los Angeles?
No. Cook uses Historic Districts and individual Landmarks under Chapter 102 Article VI. Function is similar but the regulatory label differs from California overlay zoning.
Who regulates historic homes in Oak Park or Evanston?
Each home-rule suburb runs its own preservation commission. Cook County preservation rules do not apply within those municipal boundaries.
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