UNKNOWN
Office-Medical Office Buildings/Spaces · Unknown
At a glance
UNKNOWN in Unknown, IL is listed on the Chicago / Cook County property roll as “Office-Medical Office Buildings/Spaces”, PIN 17221080970000. The roll records 70,306 sq ft of building area, a 2018 build year and an assessed value of $9,432,000. It last sold for $21,800,000 in Oct 2024.
Recorded transfers — county roll + state sale file
Sale history
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Oct 2024 | $21,800,000 | 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 | 17221080970000 |
| Site address | UNKNOWN |
| Land use (DOR) | 5-97, 5-97, 5-97, 5-97 — Office-Medical Office Buildings/Spaces |
| Building area (actual) | 70,306 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | 112,696 sq ft |
| Year built | 2018 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $9,432,000 |
Recorded owner (assessment roll)
1411 S MICHIGAN LLC
Owner mailing address: 3121 Michelson Dr 500, IRVINE, CA, 92612
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
- UNKNOWN
- City
- Unknown
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does UNKNOWN compare with other Chicago office buildings?
At 70,306 sq ft, UNKNOWN is about twice the size of 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 $134 per square foot of building area, against $158 across all office floor area on the roll.
The last recorded sale priced it at $310 per square foot.
Does the owner of UNKNOWN hold other Chicago office property?
2 Chicago office properties (2 parcels, 233K 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 UNKNOWN recently?
1 recorded transfer is on file for this parcel, the latest dated Oct 2024.
What does “Office-Medical Office Buildings/Spaces” mean for this parcel?
The Chicago / Cook County roll classifies PIN 17221080970000 as “Office-Medical Office Buildings/Spaces” (use code 5-97, 5-97, 5-97, 5-97). 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 UNKNOWN?
The recorded owner on the Chicago / Cook County assessment roll (current) is 1411 S MICHIGAN LLC. Owner mailing address on file: 3121 Michelson Dr 500, IRVINE, CA, 92612.
What companies have offices at UNKNOWN?
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 UNKNOWN?
The Chicago / Cook County roll records 70,306 sq ft of building area, a build year of 2018. It sits on a 112,696 sq ft lot.
What is the assessed value of UNKNOWN?
$9,432,000 on the Chicago / Cook County roll. Assessed values are taxable-roll figures, not market prices.
When did UNKNOWN last sell?
The last recorded transfer was in Oct 2024 for $21,800,000 ($310 per square foot).
What is the PIN for UNKNOWN?
PIN 17221080970000, site address UNKNOWN, Unknown. 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 UNKNOWN
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 17221080970000.
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, “UNKNOWN, Unknown, IL (PIN 17221080970000)”, https://buildingcensus.com/offices/chicago/office-building-045cee8a (data as of September 20, 2026).