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Research/Chicago/One Illinois Center
Public SeedReviewed August 13, 2026

One Illinois Center

111 E Wacker Dr, Chicago, IL 60601

QUALITY STATE

18% provisional source coverage

USE BOUNDARY

Not verified · Not dispatch ready

Direct answer

One Illinois Center is the commercial office tower at 111 E Wacker Drive and forms part of the larger Illinois Center complex. Public sources resolve the building alias and identify AmTrust's portfolio relationship and Stream Realty's leasing assignment, but do not establish current building-management authority or public delivery, freight, move, COI, contractor, or reservation rules. The record is graph mapped, not independently verified or dispatch ready.

Completed1970Published property record
Stories32Published building identity
Critical fields sourced18/10018% provisional coverage
Dispatch readyNoLive accuracy audit required
01

Canonical identity

The Chicago Architecture Center resolves the individual tower's canonical identity within the larger Illinois Center development. A 2023 leasing announcement supplies a dated ownership-portfolio and leasing relationship, but no newer title audit, current management directory, or building-specific operating handbook was found.

Property typeOffice
Management routeCurrent building-management authority is unresolved; Stream Realty announced a leasing assignment for AmTrust's Chicago portfolio in 2023.
Ownership claimA 2023 Stream announcement describes 111 East Wacker as part of AmTrust's Chicago portfolio. A newer title record was not audited in this packet.
Location41.88769, -87.62357
02

Area claims stay separate

Gross, rentable, and office area are not interchangeable. Factum stores each measurement with its source meaning instead of choosing a convenient single number.

City-reported gross floor area1,111,058 sq ftChicago Energy Benchmarking, data year 2023
Current listing building size1,151,686 sq ftCushman & Wakefield listing; area predicate is not stated
03

What public guidance supports

These are sourced research answers, not permission to enter, reserve, submit, or dispatch. Current affected-party authorization remains required.

Building-versus-complex identity

One Illinois Center is the tower at 111 E Wacker Drive. It participates in the broader Illinois Center complex and should not be merged with 233 N Michigan Avenue or the entire development.

Chicago Architecture Center page captured 2026-08-13

Leasing relationship

Stream Realty announced in 2023 that it would lead leasing for AmTrust's Chicago portfolio, including 111 East Wacker. Leasing representation does not establish property-management or job-approval authority.

Stream Realty announcement dated 2023-09-28

Job-operation boundary

No reviewed public source establishes a current dock, freight, delivery, move, COI, contractor, access, reservation, fee, riser, or durable confirmation workflow. Current written building requirements are required before field work.

Public-source review completed 2026-08-13
04

Questions this record answers

Each concise answer includes the same caveats shown elsewhere on the page.

01Is 111 East Wacker the same as One Illinois Center?+

Yes. The Chicago Architecture Center identifies 111 E Wacker Drive as One Illinois Center. It is one tower within the larger Illinois Center development.

02Who owns or leases One Illinois Center?+

A 2023 Stream Realty announcement describes 111 East Wacker as part of AmTrust's Chicago portfolio and names Stream as leasing representative. Factum has not treated that dated announcement as a current title or property-management audit.

03Are freight, delivery, move, or COI rules public?+

No current building-specific operating rules were confirmed in the reviewed sources. Obtain the current handbook and written confirmation directly from the authorized building team.

04Can this record be used to dispatch a job?+

No. It is graph mapped but not independently verified or dispatch ready. Current affected-party authorization and a durable confirmation receipt are still required.

05How can a building team correct this record?+

Get early access and share a correction, current handbook, link, forwarded email, or a few notes. Factum does not ask for credentials or sensitive security information.

05

Explicit unknowns

Anything operationally material that is stale, incomplete, or unconfirmed remains visible here.

  1. 01Current legal and beneficial ownership and current authorized property manager.
  2. 02Complete parcel, air-rights, garage, concourse, and complex-boundary relationships.
  3. 03Current loading-dock location, freight resource, dimensions, capacity, reservation route, availability, and fees.
  4. 04Current delivery and move windows, COI terms, contractor and labor rules, visitor access, protection, permits, disposal, and telecom-riser procedures.
  5. 05Current provider-generated approval and confirmation format for any building action.
06

Evidence register

Source links are direct. Authority and supported claim groups are stated so readers can inspect the underlying record.

  1. 01
    111 East Wacker — One Illinois Center ↗

    Chicago Architecture Center · Supports: Canonical building name, address, individual-tower identity, architect, use, and completion year

  2. 02
    AmTrust portfolio leasing announcement ↗

    Stream Realty Partners, appointed leasing representative · Supports: Dated AmTrust portfolio relationship and Stream leasing assignment for 111 East Wacker

  3. 03
    One Illinois Center listing ↗

    Cushman & Wakefield · Supports: Current public listing identity and separately stated building area

  4. 04
    Chicago Energy Benchmarking Results ↗

    City of Chicago · Supports: 2023 City-reported gross floor area and census identity