377 W ONTARIO ST
Special-CBDOffice · Chicago · 60654
At a glance
377 W ONTARIO ST in Chicago, IL is listed on the Chicago / Cook County property roll as “Special-CBDOffice”, PIN 17091280040000. The roll records 48,000 sq ft of building area, a 1899 build year and an assessed value of $8,827,000. It last sold for $5,431,375 in Jan 2026.
Recorded transfers — county roll + state sale file
Sale history
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Jan 2026 | $5,431,375 | not rated | County roll | — |
| Jul 2015 | $6,500,000 | not rated | County roll | — |
Prices are the consideration recorded in Chicago / Cook County's public property records. Where a qualification code exists it is the assessor's judgement of whether a transfer was arm's length; transfers without one appear unrated rather than assumed clean. Whether a building is on the market today, and at what price, is not a public record and is not shown here — asking prices, listings and lease terms live in private commercial databases.
Public record — 0 matched business locations
Tenants & business locations
No active business locations at this address appear in the public records ingested so far. That is a statement about the records, not the building: tenants without a county business-tax receipt or a Florida registration at this address are invisible to public data.
Chicago / Cook County assessment roll
Parcel record
| Field | Value |
|---|---|
| PIN | 17091280040000 |
| Site address | 377 W ONTARIO ST |
| Land use (DOR) | 5-91 — Special-CBDOffice |
| Building area (actual) | 48,000 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | 13,065 sq ft |
| Year built | 1899 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $8,827,000 |
Recorded owner (assessment roll)
ONTARIO 401 LLC
Owner mailing address: 202 N JUSTINE ST, CHICAGO, IL, 60607
2 Chicago office properties share this owner mailing address →
Commercial property is usually held one building per entity; a shared mailbox is how the roll reveals a portfolio. It is evidence of common ownership, not proof.
Location
- Address
- 377 W ONTARIO ST
- City
- Chicago
- ZIP
- 60654
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 377 W ONTARIO ST compare with other Chicago office buildings?
At 48,000 sq ft, 377 W ONTARIO ST is about 30% larger than the average office building on the Chicago / Cook County roll, which comes to 36,812 sq ft across 9,438 buildings.
Its assessed value works out to $184 per square foot of building area, against $158 across all office floor area on the roll.
The last recorded sale priced it at $113 per square foot.
Does the owner of 377 W ONTARIO ST hold other Chicago office property?
2 Chicago office properties (2 parcels, 54.8K sq ft) are recorded to 2 owner entities sharing this parcel's tax-bill mailing address. A shared mailing address is evidence of common ownership, not proof of it.
What has happened at 377 W ONTARIO ST recently?
2 recorded transfers are on file for this parcel, the latest dated Jan 2026.
What does “Special-CBDOffice” mean for this parcel?
The Chicago / Cook County roll classifies PIN 17091280040000 as “Special-CBDOffice” (use code 5-91). BuildingCensus includes a parcel in its office census when the roll gives it an office-class use, so the label is the county's, not an inference.
Frequently asked questions
Who owns 377 W ONTARIO ST?
The recorded owner on the Chicago / Cook County assessment roll (current) is ONTARIO 401 LLC. Owner mailing address on file: 202 N JUSTINE ST, CHICAGO, IL, 60607.
What companies have offices at 377 W ONTARIO ST?
No business locations at this building appear in the public records ingested so far — no licence, tax or registry record currently lists this address; that is a gap in the record, not proof the building is empty.
How big is 377 W ONTARIO ST?
The Chicago / Cook County roll records 48,000 sq ft of building area, a build year of 1899. It sits on a 13,065 sq ft lot.
What is the assessed value of 377 W ONTARIO ST?
$8,827,000 on the Chicago / Cook County roll. Assessed values are taxable-roll figures, not market prices.
When did 377 W ONTARIO ST last sell?
The last recorded transfer was in Jan 2026 for $5,431,375 ($113 per square foot).
What is the PIN for 377 W ONTARIO ST?
PIN 17091280040000, site address 377 W ONTARIO ST, Chicago. It is the key to look the parcel up in the Cook County Assessor parcel, commercial-valuation and sales datasets (Chicago / Cook County).
More around 377 W ONTARIO ST
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- Chicago / Cook County — Cook County Assessor parcel, commercial-valuation and sales datasets (owner names, mailing addresses, priced sales with buyer and seller); City of Chicago active business licences for occupancy. Licence addresses are street-level, and state-licensed professions are absent from the city roll.
Every fact on this page is drawn from the government records above — no listing sites, no scraped platforms, no third-party images. Facts from public records are uncopyrightable; each tenancy row carries its source and match confidence. Records can lag reality — a business-tax receipt or registration at an address is evidence of occupancy, not a lease confirmation.
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Dataset updated . Source: Chicago / Cook County assessment roll, PIN 17091280040000.
About this data
Source: Cook County Assessor parcel, commercial-valuation and sales datasets (Chicago / Cook County), as published September 20, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “377 W ONTARIO ST, Chicago, IL (PIN 17091280040000)”, https://buildingcensus.com/offices/chicago/office-building-91e511c7 (data as of September 20, 2026).