Three things, in descending order of certainty.

Employment, directly and unambiguously. Associations with staff — on-site engineers, door staff, maintenance, a building manager on the association's own payroll — are subject to the new Section 2-103.5 from June 1, 2027. Hiring criteria, scheduling policies and disciplinary practices that screen out a protected group by effect are actionable without proof of intent. This is the exposure most Illinois boards have not thought about at all.

Public accommodations, where amenities are open to non-residents. An association that rents its clubhouse to outside groups, or runs a pool or fitness facility available beyond the membership, can implicate Article 5. The analysis is fact-specific and most associations will not be public accommodations — but the ones with a genuine outside-facing amenity should not assume they are outside it.

Article 3, unsettled. The Act-wide definitional change and the amended definition of “unlawful discrimination” as discrimination “whether by purpose or effect” are now on the books and by their terms apply throughout the Act. The operative Article 3 sections were untouched. Whether that combination supports a disparate-impact housing theory against association rules is a genuinely open question, and we are not going to tell you how it comes out, because no Illinois court has said.

What we can say is where an open question of that shape leaves a board: neither restructuring its rules on the assumption of the broadest reading, nor ignoring it on the assumption of the narrowest.

The pre-existing housing standard, which has not moved

Illinois had already codified a disparate-impact standard for housing under P.A. 103-859, amending Article 3. Boards weighing exposure should start there rather than with SB 3777 — that is the provision that squarely governs real estate transactions, and it predates this Act.

What the practical review looks like

The rules most likely to produce an effects-based challenge are the familiar ones: occupancy limits stated per bedroom rather than per unit; blanket leasing prohibitions; criminal-record screening (which in Cook County already runs into the Just Housing Amendment); minimum-income requirements for tenant approval; and guest restrictions that fall hardest on multigenerational households.

For each, the defensible posture is the same and it is documentary: be able to state the substantial, legitimate interest the rule serves, and be able to show the board considered whether a less restrictive rule would serve it. That record is worth building before June 1, 2027 regardless of how the Article 3 question resolves, because it is also the record that defeats an intent-based claim.

What to watch next

Two things. Whether IDHR's charge practice under Article 3 begins pleading effects-based theories after June 1, 2027 — the Department's own release enumerates employment, financial credit and public accommodations, which suggests it reads the Act as we do. And whether the 105th General Assembly closes the gap by amending Article 3 directly, which is the obvious next bill.