The Old Post Office
404 W Harrison St, Chicago, IL 60607
80% provisional source coverage
USE BOUNDARYNot verified · Not dispatch ready
The Old Post Office is one historic Chicago office complex with different functional addresses: 404 W Harrison for garage, bicycle, loading and south-side access, and 433 W Van Buren for the historic public lobby and building contact.
Canonical identity
This Public Seed resolves one building across two first-party functional addresses and publishes current-facing management and tenant move evidence. Historical ownership, current title and live authorization remain carefully separated.
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.
Functional addresses
The May 2025 handbook identifies 404 W Harrison for parking, bicycle, loading and the south side; 433 W Van Buren is the historic public-lobby and contact address.
Tenant handbook dated May 2025; reviewed August 16, 2026Moves and freight
Major moves require at least 48 hours' advance scheduling, tenant and mover insurance, and building approval. Written schedule or approval and certificates are required receipts.
Tenant handbook dated May 2025; temporary-dock details must be reconfirmedHistoric and reporting years
The handbook says original 1921, expanded 1932 and renovated 2016–2019. The City's 2018 field is preserved only as a 2023 benchmark value, not the historic construction year.
Sources reviewed August 16, 2026Questions this record answers
Each concise answer includes the same caveats shown elsewhere on the page.
01Why does The Old Post Office have two addresses?+
First-party and City evidence describe one building: 404 W Harrison serves garage, bicycle, loading and south-side functions, while 433 W Van Buren serves the historic public lobby and contact route.
02What is required for a major tenant move?+
The May 2025 handbook calls for at least 48 hours' advance scheduling, tenant and mover insurance, and building approval. These rules do not authorize an unaffiliated requester.
03Who owns the building?+
A 2018 City ordinance names 601 W Companies Chicago LLC historically. Current deed and beneficial ownership have not been verified.
04How can I improve this record?+
Submit an authoritative public URL or dated official document and state whether it may be displayed publicly, used only for verification or retained privately. Contributions enter evidence review.
Explicit unknowns
Anything operationally material that is stale, incomplete, or unconfirmed remains visible here.
- 01Current deed owner, beneficial owner, controlling entity, PIN set and legal parcel boundaries.
- 02Current tenant roster and service contracts.
- 03Current dispatch, visitor, safety, emergency, loading, temporary-dock and after-hours validation beyond the May 2025 tenant handbook.
Evidence register
Source links are direct. Authority and supported claim groups are stated so readers can inspect the underlying record.
- 01The Old Post Office tenant handbook ↗
Official building tenant handbook · Supports: Identity, functional addresses, history, management and tenant move, COI, dock and freight procedures
- 02The Old Post Office contacts ↗
Official building site · Supports: Current-facing management, security, engineering and leasing roles
- 03The Old Post Office events ↗
Official building site · Supports: Public visitor, event and photography capabilities with contract and permit limits
- 042018 City ordinance for the Old Main Post Office ↗
City of Chicago · Supports: Historic building identity, 404 W Harrison and 433 W Van Buren linkage, and historical owner claim
- 05Chicago benchmark row 103689 ↗
City of Chicago · Supports: Benchmark identity, 2023 gross area, office use and reporting fields
Public change history
Only meaningful, accepted public deltas appear here. The current record above remains canonical.
The Old Post Office
Factum published a bounded public seed for The Old Post Office that resolves its 404 W Harrison and 433 W Van Buren functions and adds May 2025 tenant move, insurance and freight evidence with explicit currentness limits.