# Building permits at 3401 Bluff St, Boulder, CO 29 permits on record here. The newest, Jul 7: Install of Pedestrian Directional Sign. Boulder publishes permits without map coordinates, so this address has no map and no quarter-mile list. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Jul 7, 2026 | Sign | Install of Pedestrian Directional Sign | $4,500 | [SGN2026-00004](https://nearbypermits.com/boulder/permit/SGN2026-00004/) | | Jun 11, 2024 | Fire systems | 3401 Bluff street - cassiopeia (2414049) (fati) provide and install the following fire alarm devices for cassiopeia at 3401 bluff street. 1. Provide & install six (6) speaker/strobes. 2. Provide & install ten (10) strobes. 3. Provide & install two (2) duct detectors. 4. Provide & install two (2) rem | $16,410 | [FIR2024-00223](https://nearbypermits.com/boulder/permit/FIR2024-00223/) | | Jun 5, 2024 | Fire systems | Build out of core shell space. Mixed use retail and cafe area. | $8,770 | [FIR2024-00214](https://nearbypermits.com/boulder/permit/FIR2024-00214/) | | Mar 29, 2024 | Electrical | Architectural, mechanical, electrical and plumbing improvements to the north-east corner tenant space at the railyards development to create a retail sales floor, cafe and (4)gender neutral restrooms. Revisions 4/15/2024 Changes to plans | $866,925 | [BLD-NRE2023-00156](https://nearbypermits.com/boulder/permit/BLD-NRE2023-00156/) | | Jan 28, 2022 | Fire systems | Connect (1) 15 gallon Ansul R-102 UL300 System for three hood sections using 39 flow points out of 55 flow points available. See BLD-NRE2020-00209 for general building permit for first and fourth floors and BLD-NRE2020-00208 for general building permit for second and third floors. See FIR2021-00351 | $2,587 | [FIR2021-00393](https://nearbypermits.com/boulder/permit/FIR2021-00393/) | | Nov 17, 2021 | Fire systems | Build out of floors 2, 3 and 4 and the south 1/2 of 1st floor. Project consists of full notification on the buildout floors and adding 1 hood system monitor in the kitchen on the 1st floor. All existing initiation is to remain. See BLD-NRE2020-00209 for general building permit for first and fourth f | $42,000 | [FIR2021-00369](https://nearbypermits.com/boulder/permit/FIR2021-00369/) | | Nov 5, 2021 | Fire systems | Additions / alterations to the existing wet pipe fire sprinkler system to accommodate a tenant finish on the first and fourth floors. See BLD-NRE2020-00209 for general building permit for first and fourth floors and BLD-NRE2020-00208 for general building permit for second and third floors. See FIR20 | $18,519 | [FIR2021-00351](https://nearbypermits.com/boulder/permit/FIR2021-00351/) | | Sep 28, 2021 | Plumbing | Owner is removing a wall and adding 4 walls on the ground floor of the building to accommodate a small retail space at the south end of the ground floor per minor modification approval ADR2021-00105. There will be small changes to the MEP design with this revisions. There will be an extension of the | $10,000 | [PLB2021-00455](https://nearbypermits.com/boulder/permit/PLB2021-00455/) | | Sep 28, 2021 | Mechanical (HVAC) | Owner is removing a wall and adding 4 walls on the ground floor of the building to accommodate a small retail space at the south end of the ground floor per minor modification approval ADR2021-00105. There will be small changes to the MEP design with this revisions. There will be an extension of the | $10,000 | [MEC2021-01270](https://nearbypermits.com/boulder/permit/MEC2021-01270/) | | Sep 28, 2021 | Electrical | Owner is removing a wall and adding 4 walls on the ground floor of the building to accommodate a small retail space at the south end of the ground floor per minor modification approval ADR2021-00105. There will be small changes to the MEP design with this revisions. There will be an extension of the | $5,000 | [ELE2021-01059](https://nearbypermits.com/boulder/permit/ELE2021-01059/) | | Sep 28, 2021 | Alteration or repair | Owner is removing a wall and adding 4 walls on the ground floor of the building to accommodate a small retail space at the south end of the ground floor per minor modification approval ADR2021-00105. There will be small changes to the MEP design with this revisions. There will be an extension of the | $91,157 | [BLD-NRE2021-00100](https://nearbypermits.com/boulder/permit/BLD-NRE2021-00100/) | | Sep 7, 2021 | Plumbing | *Tenant finish for Twitter Floors 1 and 4 - 17564 sf total. | $187,000 | [PLB2020-00801](https://nearbypermits.com/boulder/permit/PLB2020-00801/) | | Sep 7, 2021 | Mechanical (HVAC) | *Tenant finish for Twitter Floors 1 and 4 - 17564 sf total. | $325,500 | [MEC2020-01986](https://nearbypermits.com/boulder/permit/MEC2020-01986/) | | Sep 7, 2021 | Electrical | *Tenant finish for Twitter Floors 1 and 4 - 17564 sf total. | $250,275 | [ELE2020-01794](https://nearbypermits.com/boulder/permit/ELE2020-01794/) | | Sep 7, 2021 | Alteration or repair | *Tenant finish for Twitter Floors 1 and 4 - 17564 sf total. Resubmittal after permit issuance 10/25/2021 to change occupancy classification for breakroom. | $3,085,990 | [BLD-NRE2020-00209](https://nearbypermits.com/boulder/permit/BLD-NRE2020-00209/) | | Sep 3, 2021 | Plumbing | *Tenant Finish for Twitter Floors 2 and 3 - 17564 sf total | $187,000 | [PLB2020-00800](https://nearbypermits.com/boulder/permit/PLB2020-00800/) | | Sep 3, 2021 | Mechanical (HVAC) | *Tenant Finish for Twitter Floors 2 and 3 - 17564 sf total | $325,500 | [MEC2020-01985](https://nearbypermits.com/boulder/permit/MEC2020-01985/) | | Sep 3, 2021 | Electrical | *Tenant Finish for Twitter Floors 2 and 3 - 17564 sf total | $250,275 | [ELE2020-01792](https://nearbypermits.com/boulder/permit/ELE2020-01792/) | | Sep 3, 2021 | Elevator | *Tenant Finish for Twitter Floors 2 and 3 - 17564 sf total. Resubmittal after permit issuance, 10/25/2021, to change occupancy designation of breakroom and elevator door widths. | $3,085,990 | [BLD-NRE2020-00208](https://nearbypermits.com/boulder/permit/BLD-NRE2020-00208/) | | Aug 6, 2021 | Fire systems | Add or relocate 8 sprinklers to provide code compliant coverage for new wall and ceiling layout. See BLD-NRE2021-00100 for general building permit. Railyards landlord | $440 | [FIR2021-00273](https://nearbypermits.com/boulder/permit/FIR2021-00273/) | | Jan 22, 2021 | Demolition | *Voided for inactivity - no inspections within 180 days* *Interior Demo of four suites (one on each floor) in prep of tenant finishes under BLD-NRE2020-00208 and BLD-NRE2020-00209. | Not listed | [DEM2020-00078](https://nearbypermits.com/boulder/permit/DEM2020-00078/) | | Jun 1, 2020 | Fire systems | New building fire alarm system. See FIR2020-00130 for sprinkler system. See BLD-NRE2019-00040 for general building permit. Railyards | $45,000 | [FIR2020-00175](https://nearbypermits.com/boulder/permit/FIR2020-00175/) | | Apr 23, 2020 | Fire systems | New wet pipe fire sprinkler and standpipe system per NFPA 13 & 14. See FIR2020-00175 for fire alarm permit. See BLD-NRE2019-00040 for general building permit. Railyards | $70,087 | [FIR2020-00130](https://nearbypermits.com/boulder/permit/FIR2020-00130/) | | Oct 17, 2019 | Plumbing | Construction of the core and shell of a new, 4-story building to house ground floor commercial use with 3 floors of office use above. Ground floor is intended for commercial and/or office use, and upper 3 floors are intended for office use. Associated with LUR2015-00010, LUR2015-00011, and TEC2015-0 | $377,000 | [PLB2019-00117](https://nearbypermits.com/boulder/permit/PLB2019-00117/) | | Oct 17, 2019 | Mechanical (HVAC) | Construction of the core and shell of a new, 4-story building to house ground floor commercial use with 3 floors of office use above. Ground floor is intended for commercial and/or office use, and upper 3 floors are intended for office use. Associated with LUR2015-00010, LUR2015-00011, and TEC2015-0 | $1,300,000 | [MEC2019-00285](https://nearbypermits.com/boulder/permit/MEC2019-00285/) | | Oct 17, 2019 | Electrical | Construction of the core and shell of a new, 4-story building to house ground floor commercial use with 3 floors of office use above. Ground floor is intended for commercial and/or office use, and upper 3 floors are intended for office use. Associated with LUR2015-00010, LUR2015-00011, and TEC2015-0 | $894,000 | [ELE2019-00226](https://nearbypermits.com/boulder/permit/ELE2019-00226/) | | Oct 17, 2019 | New building | Construction of the core and shell of a new, 4-story building to house ground floor commercial use with 3 floors of office use above. Ground floor is intended for commercial and/or office use, and upper 3 floors are intended for office use. Associated with LUR2015-00010, LUR2015-00011, and TEC2015-0 | $14,000,000 | [BLD-NRE2019-00040](https://nearbypermits.com/boulder/permit/BLD-NRE2019-00040/) | | Dec 14, 1993 | Electrical | Electrical replace riser at 3400 bluff street | $1,100 | [PMT1993-09317-ELE](https://nearbypermits.com/boulder/permit/PMT1993-09317-ELE/) | | Dec 3, 1991 | Mechanical (HVAC) | Mechanical replace hot water heater at 3403 bluff street | $340 | [PMT1991-S3557-MEC](https://nearbypermits.com/boulder/permit/PMT1991-S3557-MEC/) | --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 10:49 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 29 permits at this address: https://nearbypermits.com/boulder/address/3401-bluff-st/