# Building permits at 1900 9th Ave, Seattle, WA 1900 9th Ave, Seattle has 31 building permits on record. The most recent, issued Dec 17, 2025, is for alteration or repair: Construct alterations to 5th floor subject to field inspection. | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Dec 17, 2025 | Alteration or repair | Construct alterations to 5th floor subject to field inspection. | $700,000 | [7114538-CN](https://nearbypermits.com/seattle/permit/7114538-CN/) | | May 22, 2025 | Alteration or repair | Construct tenant improvements for lobby & storage space at level 1 of existing institutional building (Seattle Children's Research Institute) occupy per plan | $900,000 | [7059930-CN](https://nearbypermits.com/seattle/permit/7059930-CN/) | | Mar 19, 2025 | Mechanical (HVAC) | Construct tenant improvement in basement/L - 1 of hospital per plans. Mechanical included this permit | $4,500,000 | [7057745-CN](https://nearbypermits.com/seattle/permit/7057745-CN/) | | Jan 17, 2025 | Alteration or repair | Tenant improvements to existing kitchen and lounge areas at level 6 of existing life sciences building (Seattle Children's Research Institute) subject to field inspection. | $125,000 | [7063856-CN](https://nearbypermits.com/seattle/permit/7063856-CN/) | | Jan 22, 2024 | Alteration or repair | Tenant improvements at level 6 of existing research laboratory (Seattle Children's Research Institute - JMB Building) per plan. | $14,051 | [6984721-CN](https://nearbypermits.com/seattle/permit/6984721-CN/) | | Dec 13, 2023 | Mechanical (HVAC) | Construct tenant improvements to office & research laboratory spaces at levels 10 & 11 of existing mixed-use structure (Seattle Children's Research Institute) occupy per plan. Mechanical included | $4,321,226 | [6942095-CN](https://nearbypermits.com/seattle/permit/6942095-CN/) | | Dec 11, 2023 | Alteration or repair | Construct tenant improvements to existing commercial building (Seattle Childrens research institute) at level 7 per plan. | $750,000 | [6986423-CN](https://nearbypermits.com/seattle/permit/6986423-CN/) | | Nov 28, 2023 | Alteration or repair | Tenant Improvement to level 6 of existing lab spaces subject to field inspection STFI. | $225,000 | [6995523-CN](https://nearbypermits.com/seattle/permit/6995523-CN/) | | Jun 20, 2023 | Alteration or repair | Construct tenant improvements to existing commercial building at levels 8 and 9 subject to field inspection. | $50,000 | [6961446-CN](https://nearbypermits.com/seattle/permit/6961446-CN/) | | Aug 19, 2021 | Elevator | Construct alterations to elevator lobbies on floors 5 6 7 9 10 and 11 of Children's Research Institute building subject to field inspection (STFI). | $235,000 | [6852571-CN](https://nearbypermits.com/seattle/permit/6852571-CN/) | | Jul 23, 2021 | Alteration or repair | Partial remodel of 5th floor office space subject to field inspection STFI. | $10,000 | [6849537-CN](https://nearbypermits.com/seattle/permit/6849537-CN/) | | Jun 2, 2021 | Alteration or repair | Construct interior alterations to remodel "health rooms" at 7th 9th and 10th floors for tenant [SEATTLE CHILDRENS RESEARCH INSTITUTE] in commercial building subject to field inspection [STFI]. | $250,000 | [6841017-CN](https://nearbypermits.com/seattle/permit/6841017-CN/) | | May 4, 2021 | Alteration or repair | Construct interior non-structural alterations to portions of research lab [SEATTLE CHILDREN'S RESEARCH INSTITUTE] in commercial building per plan. | $1,900,000 | [6806832-CN](https://nearbypermits.com/seattle/permit/6806832-CN/) | | Apr 22, 2021 | Alteration or repair | Office tenant improvements to southeast portion of 5th floor subject to field inspection. | $369,192 | [6834464-CN](https://nearbypermits.com/seattle/permit/6834464-CN/) | | Jun 29, 2017 | Alteration or repair | Interior non-structural tenant improvements to existing commercial building (locker rooms/restrooms 11th floor) subject to field inspection (STFI). | $100,000 | [6605537-CN](https://nearbypermits.com/seattle/permit/6605537-CN/) | | May 30, 2017 | Alteration or repair | Alterations to existing locker rooms on 7th and 9th floors of existing medical office/lab building subject to field inspection. | $90,000 | [6599785-CN](https://nearbypermits.com/seattle/permit/6599785-CN/) | | May 8, 2017 | Alteration or repair | Construct interior alterations to existing restrooms on 11th floor of existing commercial building subject to field inspection (STFI). | $95,243 | [6595984-CN](https://nearbypermits.com/seattle/permit/6595984-CN/) | | Mar 8, 2017 | Alteration or repair | Tenant improvements (add locker rooms) to level P2 of existing office bldg subject to field inspection (STFI). | $100,000 | [6585016-CN](https://nearbypermits.com/seattle/permit/6585016-CN/) | | Mar 8, 2017 | Alteration or repair | Tenant improvements (remodel restrooms) to existing office space subject to field inspection (STFI). | $95,000 | [6585010-CN](https://nearbypermits.com/seattle/permit/6585010-CN/) | | Feb 3, 2017 | Alteration or repair | Remodel bathrooms on floors 7 and 10 of existing office building subject to field inspection (STFI). | $190,000 | [6579640-CN](https://nearbypermits.com/seattle/permit/6579640-CN/) | | Nov 9, 2015 | Alteration or repair | Interior alteration to existing commercial building (1st floor room 126 center of building) | $80,000 | [6504127-CN](https://nearbypermits.com/seattle/permit/6504127-CN/) | | Jan 18, 2013 | Mechanical (HVAC) | Tenant improvements to existing basement and first floor research lab space for Children's Research Institute per plans. (project includes mechanical work) | $600,000 | [6338721-CN](https://nearbypermits.com/seattle/permit/6338721-CN/) | | Nov 19, 2012 | Alteration or repair | Construct alterations to the storage rooms in the basement of existing medical office building (Seattle Children's Building 1) per floor plan and STFI. | $7,500 | [6343005-CN](https://nearbypermits.com/seattle/permit/6343005-CN/) | | Oct 1, 2010 | Alteration or repair | Construct tenant improvements to existing research building on floor 1 at the aquatics suite per plan | $1,600,000 | [6256108-CN](https://nearbypermits.com/seattle/permit/6256108-CN/) | | Jun 22, 2010 | Alteration or repair | Interior non-structural alteration(partion wall and new door) on level 10 for Children Hospital Research Institue per floor plan. Subject to field inspections. Stfi | $13,000 | [6252631-CN](https://nearbypermits.com/seattle/permit/6252631-CN/) | | Jul 17, 2009 | Roofing | Replace wood roof decking with granite pavers on terrace Level 10 SW corner of existing Children's Hospital Research Institute / STFI | $75,000 | [6221731-CN](https://nearbypermits.com/seattle/permit/6221731-CN/) | | Nov 24, 2008 | Mechanical (HVAC) | Interior alterations to lobby on 1st floor for "Seattle Children's research Institute" per plan. mechanical included | $595,000 | [6194084-CN](https://nearbypermits.com/seattle/permit/6194084-CN/) | | Aug 6, 2008 | Mechanical (HVAC) | Alterations to portion of research and development laboratory including raised floor slab and mechanical alteration per plan. | $225,000 | [6187948-CN](https://nearbypermits.com/seattle/permit/6187948-CN/) | | Aug 6, 2008 | Mechanical (HVAC) | Interior alterations to floors 1 5 6 & 10 (mechanical included). | $16,119,413 | [6175866-CN](https://nearbypermits.com/seattle/permit/6175866-CN/) | | Jun 1, 2007 | Alteration or repair | Interior tenant improvements to floors 7 8 & 9 no change in exiting fire resistance or energy subject to field inspection. | $200,000 | [6141671-CN](https://nearbypermits.com/seattle/permit/6141671-CN/) | | Feb 9, 2007 | Alteration or repair | Interior improvements to add vivarium in basement and support areas on 1st floor in existing lab/office building per plans | $5,270,150 | [6116800-CN](https://nearbypermits.com/seattle/permit/6116800-CN/) | --- Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr). 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