ONTARIO 401 LLC
2 office properties in Chicago / Cook County recorded to 2 owner entities mailing to 202 N JUSTINE ST, CHICAGO, IL. likely one owner
At a glance
ONTARIO 401 LLC is recorded as the owner of 2 office properties (2 parcels) in Chicago / Cook County, totalling 54.8K sq ft of building area with $9.7M of assessed value. The holdings sit in 2 owner entities that share one tax-bill mailing address in CHICAGO, IL — and a name root, which is how a single sponsor usually holds property.
County assessment roll
Properties
| Building | Submarket | Sq ft | Assessed | Last sold | Tenants |
|---|---|---|---|---|---|
| 377 W ONTARIO ST | Chicago | 48K | $8.8M | $5,431,375 · Jan 2026 | 0 |
| 4000 N LINCOLN AVE | Chicago | 6.8K | $847.1K | — | 163 |
Names on the deeds
Owner entities at this address
- ONTARIO 401 LLC
- V3F 4000 LINCOLN LLC
How this group was built. These entities share both a mailing address and a name root, which is how a single sponsor usually holds property — one entity per building.The county records an owner and a mailing address for every parcel; this page collects the office parcels whose owners mail to the same address, and counts buildings rather than parcels using the county's own condo-to-building link. Lease terms, rents and the identity of a manager acting for the owner are not public records and are not shown.
Where are ONTARIO 401 LLC's office buildings?
All 2 properties are in Chicago.
The largest is 377 W ONTARIO ST in Chicago at 48K sq ft.
Recorded build years run from 1899 to 1975.
How large is this portfolio within Chicago's office market?
Its 54.8K sq ft is 0.02% of the 347.4M sq ft of office building area on the Chicago / Cook County roll.
Its $9.7M of assessed value is 0.02% of the metro's office total.
It holds 2 of the metro's 9,438 office buildings.
1 of its parcels carry a recorded sale price; the most recent was 377 W ONTARIO ST in Jan 2026 for $5,431,375.
Frequently asked questions
How many office buildings does ONTARIO 401 LLC own in Chicago?
2 office properties (2 parcels) on the Chicago / Cook County roll, counted by building rather than by condo parcel.
What is ONTARIO 401 LLC's largest office building?
377 W ONTARIO ST, Chicago — 48K sq ft, assessed at $8.8M.
What are ONTARIO 401 LLC's office properties worth?
Their combined assessed value on the current Chicago / Cook County roll is $9,674,106. Assessed values are taxable-roll figures, not market prices.
Are these properties owned by one company?
These entities share both a mailing address and a name root, which is how a single sponsor usually holds property — one entity per building. 2 owner entities share the mailing address. It is evidence of common ownership, not proof of it.
When did one of ONTARIO 401 LLC's Chicago office properties last change hands?
The most recent recorded transfer among these parcels is 377 W ONTARIO ST, Jan 2026, for $5,431,375.
Related
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.
Dataset updated . Derived from public data sources.
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, “ONTARIO 401 LLC — Chicago office property holdings”, https://buildingcensus.com/offices/chicago/owners/ontario-401-llc-8a732a (data as of September 20, 2026).