Cushman and Wakefield's Q2 2026 Chicago Multifamily MarketBeat puts Southwest Cook County occupancy at 96.4%, the highest of any suburban Cook County submarket, with effective rent growth of 2.8% year over year, also the strongest in suburban Cook. Northwest Cook, a submarket of almost identical size, sat at 93.9% occupancy with rent growth slightly negative.
The explanation is not demand running hot. It is supply running at zero. Southwest Cook delivered no new units in the first half of 2026 and has 87 units under construction against 39,238 units of inventory, a pipeline of 0.22% of stock. Northwest Cook's pipeline is roughly five times larger on the same base. When nothing new is built, the existing stock stays full and pricing power accrues to whoever owns it.
96.4%
Southwest Cook occupancy, highest in suburban Cook (C&W, Q2 2026)
0
Units delivered in the submarket, first half of 2026 (C&W)
0.22%
Construction pipeline as a share of the submarket's 39,238 units (C&W)
The counterweight
Will County, along the I-80 corridor, is the opposite story: 570 new units delivered in the first half of 2026, with occupancy down 470 basis points year over year to 91.0%, the weakest in the metro. This is not purely a neighboring county's problem. Tinley Park itself spans Frankfort Township in Will County as well as its three Cook townships, so new supply on the corridor is a live risk to watch, not a theoretical one.
One correction to the standard pitch. The south suburbs are often sold as a rent discount, and for the broader South Cook submarket average that framing has support. For Tinley Park specifically it does not: RentCafe's Yardi-based series puts village apartment rents at $2,006 a month, statistically level with Arlington Heights and above Schaumburg and Palatine. That series covers buildings of 50 or more units only, so it does not price older small stock. But it settles the framing question. The case for this submarket is scarcity, not price.
Sources
- Cushman & Wakefield, Chicago Multifamily MarketBeat, Q2 2026 (published July 16, 2026)
- RentCafe / Yardi Matrix, Tinley Park average rents (July 2026, buildings of 50+ units)
Market commentary, not investment advice and not an offer of securities. Figures are as of the sources' stated dates.