350 LLC
5 office properties in Chicago / Cook County recorded to 5 owner entities mailing to 414 N ORLEANS 610, CHICAGO, IL. shared mailing address
At a glance
350 LLC is recorded as the owner of 5 office properties (5 parcels) in Chicago / Cook County, totalling 648K sq ft of building area with $108.1M of assessed value. The holdings sit in 5 owner entities that share one tax-bill mailing address in CHICAGO, IL — evidence of common ownership, not proof of it.
County assessment roll
Properties
| Building | Submarket | Sq ft | Assessed | Last sold | Tenants |
|---|---|---|---|---|---|
| 351 W HUBBARD ST | Chicago | 196.7K | $35.2M | — | 12 |
| 820 N ORLEANS ST | Chicago | 155.3K | $17.8M | — | 7 |
| 350 N LA SALLE ST | Chicago | 147.2K | $28.9M | — | 0 |
| 341 W CHICAGO AVE | Chicago | 76.8K | $13.7M | — | 0 |
| 400 W ERIE ST | Chicago | 72K | $12.6M | — | 18 |
Names on the deeds
Owner entities at this address
- O P LLC
- 820 ORLEANS LLC
- 350 LLC
- 750 LLC
- SPECTRUM 400 INC
How this group was built. These entities share a mailing address but not a name root. That often means one sponsor, and can also mean a shared law firm, accountant or tax servicer.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 350 LLC's office buildings?
All 5 properties are in Chicago.
The largest is 351 W HUBBARD ST in Chicago at 196.7K sq ft.
Recorded build years run from 1874 to 1989.
How large is this portfolio within Chicago's office market?
Its 648K sq ft is 0.19% of the 347.4M sq ft of office building area on the Chicago / Cook County roll.
Its $108.1M of assessed value is 0.20% of the metro's office total.
It holds 5 of the metro's 9,438 office buildings.
Frequently asked questions
How many office buildings does 350 LLC own in Chicago?
5 office properties (5 parcels) on the Chicago / Cook County roll, counted by building rather than by condo parcel.
What is 350 LLC's largest office building?
351 W HUBBARD ST, Chicago — 196.7K sq ft, assessed at $35.2M.
What are 350 LLC's office properties worth?
Their combined assessed value on the current Chicago / Cook County roll is $108,077,000. Assessed values are taxable-roll figures, not market prices.
Are these properties owned by one company?
These entities share a mailing address but not a name root. That often means one sponsor, and can also mean a shared law firm, accountant or tax servicer. 5 owner entities share the mailing address. It is evidence of common ownership, not proof of it.
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, “350 LLC — Chicago office property holdings”, https://buildingcensus.com/offices/chicago/owners/350-llc-cab2e4 (data as of September 20, 2026).