Evanston, Ill., City Code § 5 § 5-7-4

(A) General Requirement. A covered development, containing a minimum of seven (7) covered units is required to meet its inclusionary housing requirement.
(B) 7--14 Covered Units. The following are the inclusionary housing requirements for covered developments with less than fifteen (15) covered units, with a weighted average of maximum gross rents at or below sixty (60) percent AMI:
1. 7--9 covered units: One (1.0) inclusionary housing requirement.
2. 10--13 covered units: One point five (1.5) inclusionary housing requirement.
3. 14 covered units: Two (2.0) inclusionary housing requirement.
(C) 15+ Covered Units. Fifteen (15) percent of covered units in a covered development of fifteen (15) or more covered units are required to be inclusionary housing units with a weighted average of maximum gross rents at or below sixty (60) percent AMI. The resulting number of units, without rounding, will be the covered development's inclusionary housing requirement.
(D) Publicly-Funded Developments. The inclusionary housing requirement for a publicly-funded development is twice (two (2) times) the requirement in Subsection 5-7-4 (B) or (C).
(E) Meeting The Inclusionary Housing Requirement. One hundred (100) percent of the inclusionary housing requirement must be provided by the applicant. There are three (3) ways to do so:
1. Option A: Provide the inclusionary housing requirement on-site, rounded up to the nearest whole number.
2. Option B: Provide a portion of the inclusionary housing requirement on-site and pay the remaining portion of the requirement as an in-lieu fee to the affordable housing fund.
3. Option C: Pay one hundred (100) percent of the inclusionary housing requirement as an in-lieu fee to the affordable housing fund.