600 1ST AVE
Office · Seattle · 98104
At a glance
600 1ST AVE in Seattle, WA is listed on the Seattle / King County property roll as “Office”, parcel (major-minor) 0939000150. The roll records 89,355 sq ft of building area, 6 floors, a 1900 build year and an assessed value of $11,776,500. It last sold for $20,500,000 in Dec 2015. 168 active business locations at this address appear in public records.
Recorded transfers — county roll + state sale file
Sale history
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Dec 2015 | $20,500,000 | not rated | County roll | — |
Prices are the consideration recorded in Seattle / King 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 — 168 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| NOYAM LLC | # 102 | Sep 2026 | Seattle business licence | address · medium |
| CAMELOT LABS | STE 330 # 139906 | Aug 2026 | Seattle business licence | address · medium |
| E&E LAW CORP | # 330 | Aug 2026 | Seattle business licence | address · medium |
| PEAK TO PADDLE WOODWORKS LLC | # 102 | Jun 2026 | Seattle business licence | address · medium |
| HANDYMAN ON THE RUN | # 246 | Jun 2026 | Seattle business licence | address · medium |
| JAZZY HISTORIAN CONSULTING | # 102 | May 2026 | Seattle business licence | address · medium |
| BRIDGE MULTILINGUAL SOLUTION | — | May 2026 | Seattle business licence | address · medium |
| GAMUT GROUP LLC | STE 102 # 2627 | Apr 2026 | Seattle business licence | address · medium |
| STUDIO 206 LLC | — | Apr 2026 | Seattle business licence | address · medium |
| INTENTIONS BY DESIGN | # 330 | Mar 2026 | Seattle business licence | address · medium |
| ABDULAZIZ ADAM | # 102 | Mar 2026 | Seattle business licence | address · medium |
| WALNUT ART | # 330 | Feb 2026 | Seattle business licence | address · medium |
| MINDY JONES COUNSELING | # 330 | Jan 2026 | Seattle business licence | address · medium |
| BEM SKINCARE | # 102 | Jan 2026 | Seattle business licence | address · medium |
| ORBITRAX LLC | # 102 | Dec 2025 | Seattle business licence | address · medium |
| HEAL AT HOME PLLC | # 330 | Dec 2025 | Seattle business licence | address · medium |
| EAST WEST LAW | # 102 | Nov 2025 | Seattle business licence | address · medium |
| LIKELY STORY LLC | # 330 | Oct 2025 | Seattle business licence | address · medium |
| SHANNON HEALTH SOLUTIONS | # 1 | Sep 2025 | Seattle business licence | address · medium |
| FORGERA | # 102 | Sep 2025 | Seattle business licence | address · medium |
| H STOJANOVSKI PLLC | # 243 | Sep 2025 | Seattle business licence | address · medium |
| BLAST HAUS | # 102 | Aug 2025 | Seattle business licence | address · medium |
| SHAKTI IMPACT CONSULTING | # 330 | Aug 2025 | Seattle business licence | address · medium |
| UNITED HUB | # 102 | Jul 2025 | Seattle business licence | address · medium |
| TACNODE INC | — | Jul 2025 | Seattle business licence | address · medium |
| MAN ELECTRIC LLC | # 330 | Apr 2025 | Seattle business licence | address · medium |
| FLOWING RIVER PSYCHOTHERAPY PLLC | # 102 | Apr 2025 | Seattle business licence | address · medium |
| OUINVEST | — | Apr 2025 | Seattle business licence | address · medium |
| TRUEMIND MENTAL HEALTH | # 102 | Feb 2025 | Seattle business licence | address · medium |
| TRUSO AI LLC | # 102 | Feb 2025 | Seattle business licence | address · medium |
| OTRA VEZ | — | Jan 2025 | Seattle business licence | address · medium |
| COURTHOUSE DOGS FOUNDATION | # 212 | Dec 2024 | Seattle business licence | address · medium |
| NOTORIOUS MARKETING LLC | # 1 | Dec 2024 | Seattle business licence | address · medium |
| SUPERPROTEIN STUDIOS INC | — | Nov 2024 | Seattle business licence | address · medium |
| GWENDOLYN FLEMINGS | # 102 | Oct 2024 | Seattle business licence | address · medium |
| HOUSE OUR NEIGHBORS EDUCATION FUND | # 533 | Sep 2024 | Seattle business licence | address · medium |
| ATLAS DESIGN GROUP INC | — | Jul 2024 | Seattle business licence | address · medium |
| TRASH BIN TREASURES | # 102 | Jun 2024 | Seattle business licence | address · medium |
| PORCHLIGHT THERAPY PLLC | # 445 | May 2024 | Seattle business licence | address · medium |
| STILLNESS THERAPY PLLC | STE 1022 # 1165 | Apr 2024 | Seattle business licence | address · medium |
| GOLS | — | Apr 2024 | Seattle business licence | address · medium |
| THE GREER CONSULTING GROUP LLC | # 102 | Jan 2024 | Seattle business licence | address · medium |
| CLEANSLATE STAFFING SOLUTIONS | # 116 | Jan 2024 | Seattle business licence | address · medium |
| SETH GOODMAN COUNSELING PLLC | # 325 | Jan 2024 | Seattle business licence | address · medium |
| THE UNDERGROUND THEATER | # LL17 | Jan 2024 | Seattle business licence | address · medium |
| DESSERT STITCHER | # 102 | Nov 2023 | Seattle business licence | address · medium |
| FARLY LLC | # 102 | Oct 2023 | Seattle business licence | address · medium |
| HOUSE OUR NEIGHBORS | # 531 | Oct 2023 | Seattle business licence | address · medium |
| ROADSIDE ASSISTANCE & TOWING | # 1 | Aug 2023 | Seattle business licence | address · medium |
| BRAVE SOULS HEALING | # 620 | Jul 2023 | Seattle business licence | address · medium |
| VELOCITY LENDING SOLUTIONS | # 330 | Jun 2023 | Seattle business licence | address · medium |
| VISION 7 ADVERTISING | — | Jun 2023 | Seattle business licence | address · medium |
| DROPZONE.AI, INC. | # 330 | Feb 2023 | Seattle business licence | address · medium |
| STEPPERS UNITE INC | # 102 2040 | Jan 2023 | Seattle business licence | address · medium |
| BUDGET BLINDS OF SEATTLE CENTRAL SOUTH | # 106 | Jan 2023 | Seattle business licence | address · medium |
| CICADA MENTAL HEALTH PLLC | # 102 | Sep 2022 | Seattle business licence | address · medium |
| THROUGH FOREST TO SEA COUNSELING AND WELLNESS | # 102 | Sep 2022 | Seattle business licence | address · medium |
| FIORE LEGAL INC | # 200A | Jul 2022 | Seattle business licence | address · medium |
| STRATEGISTS FOR GOOD | # 102 | Jul 2022 | Seattle business licence | address · medium |
| INBAL RAIT PSYCHOTHERAPY | # 102 | May 2022 | Seattle business licence | address · medium |
| TRJ DEFENSE PLLC | # 624 | May 2022 | Seattle business licence | address · medium |
| LEAFLY | # 330 | Apr 2022 | Seattle business licence | address · medium |
| COLLABXPERTS | — | Jan 2022 | Seattle business licence | address · medium |
| PASSPORTOLOG INC | # 102 | Nov 2021 | Seattle business licence | address · medium |
| WUNDERLAND EVENTS | — | Sep 2021 | Seattle business licence | address · medium |
| Navia NA | # 102 | Jul 2021 | Seattle business licence | address · medium |
| ONE STOP PILOTS LLC | # 300E | Jun 2021 | Seattle business licence | address · medium |
| ONE STOP AVIATION LLC | # 300E | Jun 2021 | Seattle business licence | address · medium |
| YOODLI INC | # 330 | May 2021 | Seattle business licence | address · medium |
| B MASON JUDY PSYCHOTHERAPY | # 102 | May 2021 | Seattle business licence | address · medium |
| HOLMES STRUCTURES | # 200A | Jan 2021 | Seattle business licence | address · medium |
| UNIFIED RESEARCH | # 102 | Dec 2020 | Seattle business licence | address · medium |
| GABI THE SHRINK PLLC | # 102 | Nov 2020 | Seattle business licence | address · medium |
| RYSE THERAPY PLLC | # 102 | Oct 2020 | Seattle business licence | address · medium |
| FUERZA VENTURES | # 102 | Sep 2020 | Seattle business licence | address · medium |
| ARI GOODMAN, PLLC | # 102 | Aug 2020 | Seattle business licence | address · medium |
| TBILLICK LAW PLLC | — | Jul 2020 | Seattle business licence | address · medium |
| ZING OR ZING BARS | — | Apr 2020 | Seattle business licence | address · medium |
| ELIZABETH RANDALL COUNSELING, PLLC | # 414 | Mar 2020 | Seattle business licence | address · medium |
| CORE COLUMBIA INSURANCE | # 530 | Jan 2020 | Seattle business licence | address · medium |
| LAW OFFICE OF JEFF HAMILTON PLLC | # 1 | Jan 2020 | Seattle business licence | address · medium |
| ANALOGOUS ARCHITECTURE PLLC | # 530 | Oct 2019 | Seattle business licence | address · medium |
| OCEAN SKY LAB | # 330 | Jul 2019 | Seattle business licence | address · medium |
| LAW OFFICE OF HANNI CALHOUN | # 102 | Jul 2019 | Seattle business licence | address · medium |
| PAVISE LAW FIRM | # 102 | Jun 2019 | Seattle business licence | address · medium |
| ERICA MOUCH NUTRITION, LLC | # 1 | Apr 2019 | Seattle business licence | address · medium |
| SOCCER WITHOUT BORDERS | — | Apr 2019 | Seattle business licence | address · medium |
| SINGLEFILE TECHNOLOGIES INC | # 330 | Apr 2019 | Seattle business licence | address · medium |
| GROUNDSWELL STUDIO PLLC | — | Jan 2019 | Seattle business licence | address · medium |
| GANAZ INC | # 330 | Jan 2019 | Seattle business licence | address · medium |
| SYNDIO SOLUTIONS, INC. | # 330 | Jan 2019 | Seattle business licence | address · medium |
| WHITE RABBIT GROUP | # 300 | Nov 2018 | Seattle business licence | address · medium |
| CURTA INC | # 330 | Oct 2018 | Seattle business licence | address · medium |
| FACTAL | — | Sep 2018 | Seattle business licence | address · medium |
| QUEERDOC | # 330 | Jun 2018 | Seattle business licence | address · medium |
| CALICO ENERGY INC | # 440 | Feb 2018 | Seattle business licence | address · medium |
| GROW FURTHER | — | Jan 2018 | Seattle business licence | address · medium |
| SETUCY LLC | — | Jan 2018 | Seattle business licence | address · medium |
| BILBERRRY | # 413 | Jan 2018 | Seattle business licence | address · medium |
| RADIUS HOLDINGS | # 330 | Sep 2017 | Seattle business licence | address · medium |
| SUNDEW STUDIOS LLC | # 102 | Jul 2017 | Seattle business licence | address · medium |
| PNW BLACK PRIDE | # 102 | Jan 2017 | Seattle business licence | address · medium |
| PROGRESO LATINO PROGRESS ALLIANCE | # 120 | Jan 2017 | Seattle business licence | address · medium |
| THRIVE DENTAL RECRUITING | # 102 | Sep 2016 | Seattle business licence | address · medium |
| FANWIDE | # 121 | Sep 2016 | Seattle business licence | address · medium |
| CURBSIDE PROVISIONS | # 330 | Sep 2016 | Seattle business licence | address · medium |
| WATER STREET PUBLIC AFFAIRS | # 330 | Jul 2016 | Seattle business licence | address · medium |
| THATCHER PLLC | # 324 | Aug 2015 | Seattle business licence | address · medium |
| BLASTWORKS INC | # 330 | Aug 2015 | Seattle business licence | address · medium |
| 350 SEATTLE | — | Apr 2015 | Seattle business licence | address · medium |
| TEXTIO INC | # 330 | Jan 2015 | Seattle business licence | address · medium |
| MERE AMA PSYCHOTHERAPY | # 202 | Oct 2014 | Seattle business licence | address · medium |
| TLC SUITES DBA TEMPORARY LIVING CORPORATE SUITES | 239 | Sep 2014 | Seattle business licence | address · medium |
| THE JMA GROUP LLC | # 428 | May 2014 | Seattle business licence | address · medium |
| SOUND FAMILY SOLUTIONS PLLC | — | Jan 2014 | Seattle business licence | address · medium |
| THE LAW OFFICE OF LISA MULLIGAN LLC | # 102 | Jan 2014 | Seattle business licence | address · medium |
| C & C SHOP | 304 | Nov 2013 | Seattle business licence | address · medium |
| ASSET X | # 330 | Oct 2013 | Seattle business licence | address · medium |
| JOHN R MACE PS | # 438 | Sep 2013 | Seattle business licence | address · medium |
| SEEQ CORPORATION | # 330 | May 2013 | Seattle business licence | address · medium |
| VILLAGE BUILDERS LLC | # 626 | Apr 2013 | Seattle business licence | address · medium |
| TRAVEL VISA PRO LLC | # 12 | Feb 2013 | Seattle business licence | address · medium |
| CATHY GORMLEY PLLC | # 106 | Jan 2013 | Seattle business licence | address · medium |
| DELAPP DESIGN INC | # 330 | Jan 2013 | Seattle business licence | address · medium |
| HEAL TO GROW | # 531 | Jan 2013 | Seattle business licence | address · medium |
| VITAL TALK | # 605 | May 2012 | Seattle business licence | address · medium |
| GLYMPSE | — | Feb 2012 | Seattle business licence | address · medium |
| TRANSFORMATIVEMED | # 102 | Jan 2012 | Seattle business licence | address · medium |
| BMC GROUP | 300 | Jan 2012 | Seattle business licence | address · medium |
| CAMP DOUG | # 330 | Jul 2011 | Seattle business licence | address · medium |
| LAW OFFICE OF TODD ALLEN PLLC | # STE 306A | May 2011 | Seattle business licence | address · medium |
| FABCAB | # 300F | Apr 2011 | Seattle business licence | address · medium |
| NUTRIPSYCHTHERA | # 104 | Mar 2011 | Seattle business licence | address · medium |
| ADEPT THERAPEUTIC MASSAGE | # 631 | Jan 2011 | Seattle business licence | address · medium |
| THE QUERK GROUP INC | # STE 410 | Jan 2011 | Seattle business licence | address · medium |
| STACEY L MCFARLAND MSW LICSW BCD | # 202B | Jul 2010 | Seattle business licence | address · medium |
| DENTAL DEPARTURES INC | # 330 | Jan 2010 | Seattle business licence | address · medium |
| LIGHTSMITH CONSULTING LLC | # 1 | Jan 2010 | Seattle business licence | address · medium |
| CARNEY GILLESPIE PLLP | # 108 | Jan 2010 | Seattle business licence | address · medium |
| FUN BITS INTERACTIVE LLC | # STE 609 | Nov 2009 | Seattle business licence | address · medium |
| TRILLIUM360 | # 221 | Aug 2009 | Seattle business licence | address · medium |
| SERVICIOS AZTECA | # 241 | Jan 2009 | Seattle business licence | address · medium |
| BAN | # 114 | Jan 2009 | Seattle business licence | address · medium |
| DONOHUE PATRICE M | # 221 | Jan 2009 | Seattle business licence | address · medium |
| MINEEDS INC | 501 | Jul 2008 | Seattle business licence | address · medium |
| RESTPHONE LLC | # 206 | Jan 2008 | Seattle business licence | address · medium |
| CLIMB WITH YOUR FEET | # FL 1 | Apr 2007 | Seattle business licence | address · medium |
| LEXBLOG INC | # 330 | Feb 2007 | Seattle business licence | address · medium |
| BOOMZAP INC | # 330 | Aug 2006 | Seattle business licence | address · medium |
| LAW OFFICES OF TUELLA O SYKES THE | # STE 326 | Jan 2006 | Seattle business licence | address · medium |
| GIRLING KELLY DESIGN GROUP LLC | # 330 | Jan 2006 | Seattle business licence | address · medium |
| SEATTLE PRIDE | # 300D | Nov 2005 | Seattle business licence | address · medium |
| SHELLY M HUFFMAN MA LMHC | # 238 | Aug 2005 | Seattle business licence | address · medium |
| TELLMANN LEIF | # STE 314 | Jul 2004 | Seattle business licence | address · medium |
| LAW OFFICES OF JAMES C EGAN | # 100 | Jul 2004 | Seattle business licence | address · medium |
| KW MEDIA | # 1 | May 2004 | Seattle business licence | address · medium |
| LARRY E GALPERT | # 205A | Jun 2002 | Seattle business licence | address · medium |
| GLOBALCITIES.COM | 616 | Jan 2002 | Seattle business licence | address · medium |
| CREATIVE MEDIA ALLIANCE LLC | # 330 | Aug 2001 | Seattle business licence | address · medium |
| THE PRESENT BODY | # 301 | Jan 2001 | Seattle business licence | address · medium |
| THE WASHINGTON FIRM LTD | # 330 | Jan 1999 | Seattle business licence | address · medium |
| KATHERINE WEISSBOURD PHD | # 525 | Jun 1998 | Seattle business licence | address · medium |
| DENNIS L MCGURE ATTY AT LAW | # 106 | Mar 1998 | Seattle business licence | address · medium |
| MCKEE APPRAISAL | # 102 | Apr 1995 | Seattle business licence | address · medium |
| WEST SEATTLE YOGA & AYURVEDA | # 617 | Oct 1993 | Seattle business licence | address · medium |
| JOHNNIE MCKINLEY | 428 | Oct 1992 | Seattle business licence | address · medium |
| BODYMIND BASICS | # 214 | Jun 1990 | Seattle business licence | address · medium |
| WA ASSN OF CRIMINAL DEFENSE LAWYERS | # 102 | Jan 1987 | Seattle business licence | address · medium |
Seattle / King County assessment roll
Parcel record
| Field | Value |
|---|---|
| parcel (major-minor) | 0939000150 |
| Site address | 600 1ST AVE |
| Land use (DOR) | — Office |
| Building area (actual) | 89,355 sq ft |
| Floors / units / buildings | 6 / — / 1 |
| Lot size | — |
| Year built | 1900 |
| Zoning (primary) | — |
| Land value | $5,746,000 |
| Building value | — |
| Total assessed value | $11,776,500 |
Recorded owner (assessment roll)
No owning organisation shown. Where the county roll names a private individual, the name and mailing address are not published here.
Location
- Address
- 600 1ST AVE
- City
- Seattle
- ZIP
- 98104
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 600 1ST AVE compare with other Seattle office buildings?
At 89,355 sq ft, 600 1ST AVE is about twice the size of the average office building on the Seattle / King County roll, which comes to 46,649 sq ft across 4,289 buildings.
Its assessed value works out to $132 per square foot of building area, against $230 across all office floor area on the roll.
The last recorded sale priced it at $229 per square foot.
Does the owner of 600 1ST AVE hold other Seattle office property?
Seattle / King County's published roll does not include owner names, so no owner is shown for any parcel in this metro.
What has happened at 600 1ST AVE recently?
1 recorded transfer is on file for this parcel, the latest dated Dec 2015.
What does “Office” mean for this parcel?
The Seattle / King County roll classifies parcel (major-minor) 0939000150 as “Office”. 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 600 1ST AVE?
Seattle / King County's published roll does not include owner names, so no owner is shown.
What companies have offices at 600 1ST AVE?
168 active business locations at this building appear in Seattle / King County public records, including NOYAM LLC, CAMELOT LABS, E&E LAW CORP, PEAK TO PADDLE WOODWORKS LLC, HANDYMAN ON THE RUN. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 600 1ST AVE?
The Seattle / King County roll records 89,355 sq ft of building area, 6 floors, a build year of 1900.
What is the assessed value of 600 1ST AVE?
$11,776,500 on the Seattle / King County roll. Assessed values are taxable-roll figures, not market prices.
When did 600 1ST AVE last sell?
The last recorded transfer was in Dec 2015 for $20,500,000 ($229 per square foot).
What is the parcel (major-minor) for 600 1ST AVE?
Parcel (major-minor) 0939000150, site address 600 1ST AVE, Seattle. It is the key to look the parcel up in the King County Assessor bulk extracts and Seattle open data (Seattle / King County).
More around 600 1ST AVE
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- Seattle / King County — King County Assessor bulk extracts and Seattle open data. Washington law restricts commercial use of lists of individuals, so this metro is built without personal names by design: the county's name-stripped account file provides mailing addresses (portfolios group by mailing cluster, unnamed), sales show price and date but never buyer or seller, and tenants are business licence trade names.
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: Seattle / King County assessment roll, parcel (major-minor) 0939000150.
About this data
Source: King County Assessor bulk extracts and Seattle open data (Seattle / King County), as published September 20, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “600 1ST AVE, Seattle, WA (parcel (major-minor) 0939000150)”, https://buildingcensus.com/offices/seattle/office-building-af592ef2 (data as of September 20, 2026).