# Building permits at 2001 6th Ave, Seattle, WA

2001 6th Ave, Seattle has 51 building permits on record. The most recent, issued Aug 29, 2025, is for addition or alteration: Construct alterations to existing commercial building at rooftop per plan.

| Date | Type | Work | Cost | Permit |
|---|---|---|---|---|
| Aug 29, 2025 | Addition or alteration | Construct alterations to existing commercial building at rooftop per plan. | $400,000 | [7087993-CN](https://nearbypermits.com/seattle/permit/7087993-CN/) |
| Jun 4, 2024 | Addition or alteration | Construct alterations to install steel skid for UPS battery cabinets to sit on within existing commercial building (Westin Bldg.) per plan. | $15,000 | [7014982-CN](https://nearbypermits.com/seattle/permit/7014982-CN/) |
| Apr 25, 2023 | Addition or alteration | Soft demo for tenant space subject to field inspection STFI. | $105,000 | [6960790-CN](https://nearbypermits.com/seattle/permit/6960790-CN/) |
| Apr 11, 2023 | Addition or alteration | Alterations to portion of 30th floor offices to remove furnishings and equipment per plans. Project includes mechanical work. | $400,000 | [6948820-CN](https://nearbypermits.com/seattle/permit/6948820-CN/) |
| Dec 1, 2022 | Addition or alteration | Tennant improvements to existing tenant space per STFI | $107,000 | [6936096-CN](https://nearbypermits.com/seattle/permit/6936096-CN/) |
| Nov 2, 2022 | Addition or alteration | Construct tenant improvements to existing commercial building on 19th floor (Digital Ready) occupy per plan. | $598,000 | [6904118-CN](https://nearbypermits.com/seattle/permit/6904118-CN/) |
| Sep 20, 2022 | Addition or alteration | Interior alterations to existing commercial space subject to field inspection STFI. | $105,000 | [6917645-CN](https://nearbypermits.com/seattle/permit/6917645-CN/) |
| Mar 29, 2022 | Addition or alteration | Change use from office to data storage center and construct alterations for same on 16th and portion of 17th floor of a commercial high-rise occupy per plan. (Mechanical included this permit) | $200,000 | [6853520-CN](https://nearbypermits.com/seattle/permit/6853520-CN/) |
| Nov 16, 2020 | Addition or alteration | Voluntary seismic retrofit for commercial building per plan. | $600,000 | [6784910-CN](https://nearbypermits.com/seattle/permit/6784910-CN/) |
| Jul 2, 2020 | Tenant Improvment | Blanket permit tenant improvements to office space for Westin Building Exchange on the 19th floor per plans. | $432,000 | [6787633-BK](https://nearbypermits.com/seattle/permit/6787633-BK/) |
| May 16, 2017 | Addition or alteration | Construct interior alterations to existing office and utility spaces at 9th and 10th floors per plan. | $775,000 | [6577042-CN](https://nearbypermits.com/seattle/permit/6577042-CN/) |
| Jan 31, 2017 | Addition or alteration | Tenant improvements to suite 2323 located on the 23rd floor of the existing commercial building subject to field inspection (STFI). | $120,000 | [6578996-CN](https://nearbypermits.com/seattle/permit/6578996-CN/) |
| Dec 31, 2015 | Addition or alteration | Alterations to existing commercial building on the exterior per plan. | $400,000 | [6474782-CN](https://nearbypermits.com/seattle/permit/6474782-CN/) |
| Jul 29, 2015 | Addition or alteration | Closed as incomplete - expired permit. Construct tenant improvement to the 19th floor per plans. | $150,000 | [6410268-CN](https://nearbypermits.com/seattle/permit/6410268-CN/) |
| May 6, 2015 | Addition or alteration | Interior alterations to suite 1800F subject to field inspection (STFI). | $700,000 | [6472479-CN](https://nearbypermits.com/seattle/permit/6472479-CN/) |
| Apr 16, 2015 | Addition or alteration | Non-structural interior alterations to portions of levels 2 and 3 at parking offices space and sky bridge of existing commercial building per plan. | $275,000 | [6456920-CN](https://nearbypermits.com/seattle/permit/6456920-CN/) |
| Dec 1, 2014 | Addition or alteration | Construct alterations to existing elevator lobby access per plans. | $150,000 | [6433432-CN](https://nearbypermits.com/seattle/permit/6433432-CN/) |
| Sep 12, 2014 | Addition or alteration | Construct non structural alterations to the 17th floor of existing commercial building per floor plan subject to field inspection (STFI) | $175,000 | [6436289-CN](https://nearbypermits.com/seattle/permit/6436289-CN/) |
| Aug 28, 2014 | Addition or alteration | Install steel skids in suite 1000 east on 10th floor of the Westin Office Bldg to support installation of data center battery packs per plans. | $21,000 | [6426329-CN](https://nearbypermits.com/seattle/permit/6426329-CN/) |
| Aug 28, 2014 | Addition or alteration | Install steel skids in suite 400 on 4th floor of the Westin Office Bldg to support installation of data center battery packs per plans. | $17,800 | [6426318-CN](https://nearbypermits.com/seattle/permit/6426318-CN/) |
| Apr 17, 2014 | Tenant Improvment | Blanket Permit for interior non-structural alterations. All work for the 27th floor for Westin. | – | [6410812-BK](https://nearbypermits.com/seattle/permit/6410812-BK/) |
| Jun 22, 2013 | Addition or alteration | Alterations to lobby entries for existing office building per plans. | $50,000 | [6355192-CN](https://nearbypermits.com/seattle/permit/6355192-CN/) |
| Mar 29, 2013 | Tenant Improvment | Blanket Permit for interior non-structural alterations 1st 2nd & 3rd floor. For (Westin building) per plans. | – | [6357288-BK](https://nearbypermits.com/seattle/permit/6357288-BK/) |
| Dec 12, 2012 | Tenant Improvment | Blanket Permit for interior non-structural alterations. Demolish one additional wall add one wall a door and two lights on 12th floor for Equinix per plan. | – | [6343506-BK](https://nearbypermits.com/seattle/permit/6343506-BK/) |
| Jul 12, 2012 | Tenant Improvment | Blanket Permit for interior non-structural alterations for 3rd floor. | – | [6323762-BK](https://nearbypermits.com/seattle/permit/6323762-BK/) |
| Nov 18, 2011 | Addition or alteration | Westin bldg. Removal of existing skybridge and construct new skybridge @ 2020 5th ave/bldg per plan. bldg Westin garage bldg. 6th and Lenora bldg. (Review and processing for 4 ap's under 6292157.) | $7,500 | [6294136-CN](https://nearbypermits.com/seattle/permit/6294136-CN/) |
| Oct 4, 2011 | Addition or alteration | Closed as incomplete - expired permit. Alterations to construct opening between two office buildings (2001 and 2033 6th Ave) per plans (reviews and processing for 2 A/P's under 6293297) | $7,500 | [6293761-CN](https://nearbypermits.com/seattle/permit/6293761-CN/) |
| Jul 21, 2011 | Tenant Improvment | Blanket Permit for interior non-structural alterations to 3rd floor. | – | [6288061-BK](https://nearbypermits.com/seattle/permit/6288061-BK/) |
| Jun 20, 2011 | Tenant Improvment | Blanket Permit for interior non-structural alterations to 3-tier Floor 21 | – | [6285576-BK](https://nearbypermits.com/seattle/permit/6285576-BK/) |
| Jun 4, 2010 | Tenant Improvment | Administrative blanket permit for TI for 19th floor. | – | [6249574-BK](https://nearbypermits.com/seattle/permit/6249574-BK/) |
| May 17, 2010 | Addition or alteration | Construction of frame work above exising skybridge to westin bldg and structual alterations to floors in Westin Bldg per plan | $35,000 | [6243864-CN](https://nearbypermits.com/seattle/permit/6243864-CN/) |
| May 13, 2010 | Tenant Improvment | Blanket permit for floor 27 Nine Points Capital Managment. | – | [6246791-BK](https://nearbypermits.com/seattle/permit/6246791-BK/) |
| Jan 5, 2010 | Tenant Improvment | Administrative blanket permit reestablished from PTS #2301501. Demolition of existing space and remodel (new walls flooring etc.) Work on 4th Floor. | – | [6235413-BK](https://nearbypermits.com/seattle/permit/6235413-BK/) |
| Dec 9, 2008 | Addition or alteration | Install rooftop microwave dish on Westin Hotel to existing frame per and reuse existing cable conduit per plan. | $40,000 | [6165944-CN](https://nearbypermits.com/seattle/permit/6165944-CN/) |
| Nov 20, 2008 | Addition or alteration | Closed as incomplete - expired permit. Construct/reconfigure entry doors on NE and SE corners on ground floor of existing commercial building per plan. | $90,000 | [6201583-CN](https://nearbypermits.com/seattle/permit/6201583-CN/) |
| Nov 5, 2008 | Tenant Improvment | Blanket permit for Telus Communications on Floor 29 expanding into adjacent tenant space. | – | [6196602-BK](https://nearbypermits.com/seattle/permit/6196602-BK/) |
| Jun 16, 2008 | Addition or alteration | Tenant improvement for 5th floor of westin building including mechanical work per plan. | $1,200,000 | [6169646-CN](https://nearbypermits.com/seattle/permit/6169646-CN/) |
| Mar 31, 2008 | Tenant Improvment | Blanket Permit for interior non-structural alterations for the 11th floor. Switch & data | – | [6173825-BK](https://nearbypermits.com/seattle/permit/6173825-BK/) |
| Feb 8, 2008 | Tenant Improvment | Blanket permit for 22nd floor Gartner Inc. | – | [6168790-BK](https://nearbypermits.com/seattle/permit/6168790-BK/) |
| Jan 18, 2008 | Tenant Improvment | Blanket Permit for interior non-structural alterations for 2001 6th LLC on the 3rd floor | – | [6164489-BK](https://nearbypermits.com/seattle/permit/6164489-BK/) |
| Aug 17, 2007 | Addition or alteration | Construction of a Seattle City Light Transformer Vault to add additional power resources throughout the buildings per plans | $1,364,000 | [6129499-CN](https://nearbypermits.com/seattle/permit/6129499-CN/) |
| Jul 5, 2007 | Addition or alteration | Remove existing elevator #7 and revise shaft for communications and electrical distribution from basement through floor 15 per plans. | $150,000 | [6134530-CN](https://nearbypermits.com/seattle/permit/6134530-CN/) |
| Jun 19, 2007 | Addition or alteration | Switch gear room Tenant improvement to 1st floor and lobby area per plan. Westin Building. | $30,000 | [6134521-CN](https://nearbypermits.com/seattle/permit/6134521-CN/) |
| Jan 10, 2007 | Addition or alteration | Non-structural alterations to 21st floor (suite 2100) of Westin building. Per IAP/plans | $30,000 | [6124958-CN](https://nearbypermits.com/seattle/permit/6124958-CN/) |
| Dec 26, 2006 | Addition or alteration | Interior tenant improvement to existing commercial office per plan subject to field inspection | $15,000 | [6123715-CN](https://nearbypermits.com/seattle/permit/6123715-CN/) |
| Nov 2, 2006 | Addition or alteration | Create a seperate tenant space to exisitng office space westside of the 24th floor per plan | $40,000 | [6113313-CN](https://nearbypermits.com/seattle/permit/6113313-CN/) |
| Oct 24, 2006 | Addition or alteration | Construct non-structural interior alterations to existing office space on 23rd floor (suite 2302) of Westin Building per plans | $7,500 | [6117397-CN](https://nearbypermits.com/seattle/permit/6117397-CN/) |
| Jul 20, 2006 | Addition or alteration | Closed as Incomplete - Expired Permit Alter existing office space (5th Floor-NorthEast portion) subject to field inspection. | $45,000 | [6106588-CN](https://nearbypermits.com/seattle/permit/6106588-CN/) |
| Nov 14, 2005 | Addition or alteration | Non-structural tenant improvements to suite 2100 subject to field inspection | $25,000 | [6078939-CN](https://nearbypermits.com/seattle/permit/6078939-CN/) |
| Oct 3, 2005 | Addition or alteration | Commercial tenant improvement to change the use from retail to a restaurant in suite #102 for "Sound Soups " and occupy per plan. | $35,000 | [6069802-CN](https://nearbypermits.com/seattle/permit/6069802-CN/) |
| May 15, 2003 | Addition or alteration | Voluntary seismic retrofit per plans | $200,000 | [6120328-CN](https://nearbypermits.com/seattle/permit/6120328-CN/) |

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Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr). Checked 2026-10-01 12:40 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/