Affordable Housing Special Assessment Program (AHSAP)
AHSAP (administered by the Cook County Assessor) reduces the assessed value of qualifying multifamily rental buildings that maintain affordability. Replaces legacy Class 9 for most use cases.
Check an Address — Free Snapshot
Explore location-based incentives alongside Affordable Housing Special Assessment Program (AHSAP). This program requires a separate review of its business or project requirements.
Published criteria — confirm with Cook County Assessor's Office — Affordable Housing
- Multifamily rental property in Cook County
- Multifamily rental with affordability commitment
- Capital expenditure meeting tier threshold ($8.16-$12.75/sf for 2026)
Affordable Housing Special Assessment Program (AHSAP) is administered at the county level. Depending on the program, eligibility may depend on the specific location, property type, or business activity rather than a single drawn boundary.
Boundaries are precise and change over time, so whether a specific address falls inside a mapped zone always depends on that exact address. The fastest way to check is to run a free snapshot for the parcel you have in mind — mapped coverage is a location signal, not an eligibility determination.
Range on file · 25% (Tier 15) or 35% (Tier 35) assessed-value reduction
Most recently published round offered 25% (Tier 15) or 35% (Tier 35) assessed-value reduction. (No round currently open as of 2026-10-09.)
- +25% assessed-value reduction under Tier 15; 35% under Tier 35
- +2026 capital-expenditure thresholds: $8.16/sf (Tier 15) and $12.75/sf (Tier 35), with replacement of 2 primary building systems
- +Low Affordability Community tier requires $61.20/sf and replacement of 5 primary building systems
- +Multi-year benefit; renewable with continued compliance
Application timing can change. Verify current availability and instructions with the administering agency before relying on this program.
Verify current status on the official source- Part 1 + Part 2 application forms
- Affordability covenant / rent restriction agreement
- Capital expenditure documentation meeting per-sf threshold
- Documentation of replacement of 2 primary building systems
- Annual recertification of affordable units
This page is a starting point, not eligibility, legal, or tax advice. Verify current requirements, deadlines, and boundaries with the administering agency before applying or spending money — program rules and funding change over time.
- Phone
- (312) 443-7550
- Web
- Visit site ↗
Last verified 2026-10-09
Cook County reduces property tax assessments for small commercial projects to encourage new construction, substantial rehabilitation, or reoccupancy of abandoned commercial buildings.
The Catalyst Grant provides up to $100,000 to established small businesses in Cook County for equipment, facilities, and hiring — funded through ARPA dollars.
C-PACE provides up to 100% upfront financing from private capital for energy efficiency, renewable energy, and water conservation improvements to commercial buildings, repaid through property tax bills.
Free one-on-one business advising through 13 Business Support Organizations and 30+ referral partners. No cost, no eligibility requirements beyond being in Cook County.