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Research/Chicago/One North LaSalle
Public SeedReviewed August 15, 2026

One North LaSalle

1 N LaSalle St, Chicago, IL 60602

QUALITY STATE

10% provisional source coverage

USE BOUNDARY

Not verified · Not dispatch ready

Direct answer

One North LaSalle is a historic Art Deco office tower at 1 N LaSalle Street and an official Chicago landmark. The current property site publishes a main building-office number and Bradford Allen leasing contacts. Current legal title, parcel identity, property-management authority and operating rules remain unverified.

Completed1929Published property record
StoriesUnknownConflicting or unavailable
Critical fields sourced10/10010% provisional coverage
Dispatch readyNoLive accuracy audit required
01

Canonical identity

This Public Seed separates official landmark identity from reported ownership transactions and current leasing presentation. Conflicting floor, area, completion-year and contact-title claims remain visible. Amenities and a tenant portal are not treated as access, booking, vendor or dispatch rules.

Property typeOffice
Management routeA current property-management entity was not verified. The property site publishes a main building-office number and Bradford Allen leasing contacts.
Ownership claimA 2024 transaction release reports acquisition by Namdar Realty Group and Mason Asset Management, but current deed or tax title was not independently verified.
Location41.88232, -87.632
02

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.

2024 reported area493,738 sq ftTransaction-report figure; measurement basis not stated
2020 reported area500,000 sq ftRounded leasing-announcement figure; conflict retained
03

What public guidance supports

These are sourced research answers, not permission to enter, reserve, submit, or dispatch. Current affected-party authorization remains required.

Landmark identity

The City of Chicago lists the One North LaSalle Building as a designated landmark. The property site also describes its Art Deco character and National Register status.

City and property pages reviewed August 15, 2026

Current-facing contacts

The property site publishes a main building-office telephone and three Bradford Allen leasing contacts. Their operational authority is not public.

Current property pages reviewed August 15, 2026

Dispatch state

No current public access, loading, freight, move, COI, life-safety or telecom procedure qualified for dispatch.

Public-source review completed August 15, 2026
04

Questions this record answers

Each concise answer includes the same caveats shown elsewhere on the page.

01Is One North LaSalle a Chicago landmark?+

Yes. The City of Chicago landmark index lists the One North LaSalle Building.

02Who owns One North LaSalle?+

A November 2024 transaction release reports acquisition by Namdar Realty Group and Mason Asset Management. Current recorded title was not independently verified.

03Can the public building-office number authorize a move or vendor?+

Not based on available evidence. It is an inquiry channel only; written building authorization and required receipts remain necessary.

04How can I improve this record?+

Submit a current public handbook, dock guide, move rule or COI package and state whether it may be displayed publicly, used only for verification or retained privately. Contributions enter evidence review.

05

Explicit unknowns

Anything operationally material that is stale, incomplete, or unconfirmed remains visible here.

  1. 01Cook County PIN, parcel boundary, recorded deed owner and current taxpayer.
  2. 02Current property-management entity, property manager, engineer, security and emergency contacts.
  3. 03Resolution of 47 versus 48 floors, 493,738 versus approximately 500,000 square feet and 1929 versus 1930 completion framing.
  4. 04Visitor, after-hours, badge, accessible-entry and security procedures.
  5. 05Loading dock, freight elevator, deliveries, moves, reservations, fees and protection requirements.
  6. 06Vendor onboarding, COI limits, additional-insured language and submission route.
  7. 07Life-safety systems, evacuation, impairment and emergency contacts.
  8. 08Telecom providers, demarc, riser manager, capacity and access workflow.
06

Evidence register

Source links are direct. Authority and supported claim groups are stated so readers can inspect the underlying record.

  1. 01
    One North LaSalle property site ↗

    Current property website · Supports: Canonical identity, historic character, landmark and register assertions, amenities and leasing contacts

  2. 02
    One North LaSalle contact page ↗

    Current property website · Supports: Main building-office number and current-facing leasing contacts; title conflicts retained

  3. 03
    Chicago Landmarks alphabetical list ↗

    City of Chicago · Supports: Official landmark identity

  4. 04
    Bradford Allen leasing announcement ↗

    Leasing firm announcement dated December 8, 2020 · Supports: Historical leasing assignment, then-owner, physical attributes and renovation

  5. 05
    Namdar and Mason acquisition announcement ↗

    Transaction announcement dated November 15, 2024 · Supports: Reported acquisition, continuing leasing role and source-specific physical attributes

  6. 06
    Chicago Energy Benchmarking — Covered Buildings ↗

    City of Chicago · Supports: Benchmark ID 103640, address and geography