300 South Riverside Plaza
300 S Riverside Plaza, Chicago, IL 60606
80% provisional source coverage
USE BOUNDARYNot verified · Not dispatch ready
300 South Riverside Plaza is a 23-story Class A office building at 300 S Riverside Plaza in Chicago. Building-controlled sources publish Third Millennium Group as owner, CBRE as manager and Telos Group as leasing contact. Its parcel, legal title, current named contacts and live operating authority remain unverified. It is Graph Mapped, not Verified or Dispatch Ready.
Canonical identity
This Public Seed records the building identity, physical profile and public organizational relationships. A dated tenant manual provides evidence that operating processes exist, but the public projection excludes detailed access, security and life-safety procedures and does not create any right to act.
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.
What public guidance supports
These are sourced research answers, not permission to enter, reserve, submit, or dispatch. Current affected-party authorization remains required.
Public roles
Building-controlled pages publish Third Millennium Group, CBRE and Telos Group in owner, management and leasing roles. These statements do not establish legal title or action authority.
Current-undated pages reviewed August 16, 2026Operating evidence
An August 2025 tenant manual documents tenant-facing access, delivery, insurance and telecom coordination processes. Its details require current building confirmation and authorized tenant status before any action.
Manual dated August 2025; reviewed August 16, 2026Conflicts
Public sources conflict on construction year, management-office suite and after-hours timing; no conflicting value is normalized into a current rule.
Conflict review completed August 16, 2026Questions this record answers
Each concise answer includes the same caveats shown elsewhere on the page.
01What is 300 South Riverside Plaza?+
It is a 23-story Class A office building at 300 S Riverside Plaza in Chicago with about 1.1 million rentable square feet according to building-controlled sources.
02Who owns and manages 300 South Riverside Plaza?+
Building-controlled pages publish Third Millennium Group as owner and CBRE as manager. Factum has not independently established legal title or current authority for any named person.
03Can this record be used to request access, deliveries or telecom work?+
No. Those actions require verified tenant or building authority and a durable approval or work-order receipt.
04How can I correct or enrich this record?+
Submit an authoritative public URL or dated official document, identify the exact field and effective date, and choose public-display, verification-only or private-retention permission. Contributions enter evidence review and never overwrite canonical claims directly.
Explicit unknowns
Anything operationally material that is stale, incomplete, or unconfirmed remains visible here.
- 01Cook County PIN, parcel boundary, legal title and assessor ownership.
- 02Current named building personnel and their authority.
- 03Current building-specific permits, inspections and violations.
- 04Current access, loading, COI, emergency and telecom-riser procedures beyond the dated source.
Evidence register
Source links are direct. Authority and supported claim groups are stated so readers can inspect the underlying record.
- 01300 South Riverside Plaza building page ↗
Building-controlled source, reviewed August 16, 2026 · Supports: Identity, source-qualified ownership and physical profile
- 02300 South Riverside Plaza contact page ↗
Building-controlled source, reviewed August 16, 2026 · Supports: Owner, manager and leasing organization roles
- 03300 South Riverside Plaza tenant information ↗
Building-controlled public tenant page, reviewed August 16, 2026 · Supports: Current public building summary and existence of tenant processes
- 04300 South Riverside Plaza tenant manual ↗
Building-controlled tenant manual dated August 2025 · Supports: Existence and vintage of tenant-facing operating processes; no action authorization
Public change history
Only meaningful, accepted public deltas appear here. The current record above remains canonical.
300 South Riverside Plaza
Factum published a Public Seed for 300 South Riverside Plaza with sourced identity and management relationships, visible conflicts and explicit operating limitations.