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Sublease share continues to decline across Chicago’s office market

Tightening inventory removes a key headwind to future rent growth
CoStar Analytics
March 12, 2026 | 2:03 P.M.

Chicago’s office market continues to show incremental signs of stabilization, as both overall availability and the share of space offered via sublease trend lower. As of the latest reading, total available office space across the Chicago market stands at 95.6 million square feet, with approximately 8% of that inventory being marketed as sublease space. This sublease share remains well below the national average of 10.9%, underscoring a relative improvement in Chicago’s supply dynamics compared to peer markets.

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