# Building permits at 3720 Walnut St, Boulder, CO 3720 Walnut St: demolition permitted Mar 19, a new building Mar 20. 13 permits on record here. The newest, Sep 15: Install new addressable fire alarm system. 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 | |---|---|---|---|---| | Sep 15, 2026 | Fire systems | Install new addressable fire alarm system | $31,860 | [FIR2026-00272](https://nearbypermits.com/boulder/permit/FIR2026-00272/) | | May 22, 2026 | Other | TEC2024-00035 - Rocky Mountain Rescue \| permit to capture Stormwater Facilities fees and inspections - SITE LESS THAN 1 ACRE | Not listed | [ECP2026-00006](https://nearbypermits.com/boulder/permit/ECP2026-00006/) | | Mar 20, 2026 | Electrical | Temp board for project power and site trailer, 200A main disconnect, 200A main breaker, panel board, and Meter socket. | Not listed | [ELE2026-00291](https://nearbypermits.com/boulder/permit/ELE2026-00291/) | | Mar 20, 2026 | New building | New 3-story non-residential building for Rocky Mountain Rescue. First floor (9,683 SF) with accessory storage, assembly, business and exercise room uses. Second floor (7,839 SF) with accessory storage, assembly, business and kitchen uses. The third floor (1,025 SF) with accessory storage, assembly a | $15,719,545 | [BLD-NRE2025-00037](https://nearbypermits.com/boulder/permit/BLD-NRE2025-00037/) | | Mar 19, 2026 | Demolition | removal of a one story 2450 sf metal building to allow construction of a new facility for Boulder County on this site | Not listed | [DEM2026-00025](https://nearbypermits.com/boulder/permit/DEM2026-00025/) | | Jan 25, 2008 | Alteration or repair | Erection of a training & test tower for Rocky Mountain Rescue -- affiliated with BCSO. Tower has been donated to RMR, valuation is for foundation elements for tower. (fees waived per intergovernmental agreeement) | $600 | [PMT2008-00054](https://nearbypermits.com/boulder/permit/PMT2008-00054/) | | Oct 31, 2007 | Plumbing | Rocky mountain Rescue. tenant remodel. | $3,000 | [PMT2007-04452-PLB](https://nearbypermits.com/boulder/permit/PMT2007-04452-PLB/) | | Oct 31, 2007 | Mechanical (HVAC) | Rocky mountain Rescue. tenant remodel. | $10,000 | [PMT2007-04452-MEC](https://nearbypermits.com/boulder/permit/PMT2007-04452-MEC/) | | Oct 31, 2007 | Electrical | Rocky mountain Rescue. tenant remodel. | $10,000 | [PMT2007-04452-ELE](https://nearbypermits.com/boulder/permit/PMT2007-04452-ELE/) | | Oct 31, 2007 | Alteration or repair | Rocky mountain Rescue. tenant remodel. | $15,000 | [PMT2007-04452](https://nearbypermits.com/boulder/permit/PMT2007-04452/) | | Aug 29, 2007 | Demolition | Interior non-structural demolition. | Not listed | [PMT2007-03775-DEM](https://nearbypermits.com/boulder/permit/PMT2007-03775-DEM/) | | Apr 24, 2001 | Sign | Install new illuminated wall sign. | $2,000 | [PMT2001-01452-SGN](https://nearbypermits.com/boulder/permit/PMT2001-01452-SGN/) | | Jan 5, 1994 | New building | Install horizontal lp gas tank the original general permit number is 940102. | $2,000 | [PMT1994-00102](https://nearbypermits.com/boulder/permit/PMT1994-00102/) | ## More on this street Other addresses on Walnut St with permits, nearest house number first: - [3750 Walnut St](https://nearbypermits.com/boulder/address/3750-walnut-st/): newest permit Dec 20, 2024 - [3333 Walnut St](https://nearbypermits.com/boulder/address/3333-walnut-st/): newest permit Nov 17, 2025 - [3300 Walnut St](https://nearbypermits.com/boulder/address/3300-walnut-st/): newest permit Jun 2, 2025 - [3250 Walnut St](https://nearbypermits.com/boulder/address/3250-walnut-st/): newest permit May 16, 2025 - [3201 Walnut St](https://nearbypermits.com/boulder/address/3201-walnut-st/): newest permit Nov 18, 2025 - [3151 Walnut St](https://nearbypermits.com/boulder/address/3151-walnut-st/): newest permit Nov 8, 2024 - [3003 Walnut St](https://nearbypermits.com/boulder/address/3003-walnut-st/): newest permit Jul 31, 2025 - [4730 Walnut St](https://nearbypermits.com/boulder/address/4730-walnut-st/): newest permit May 21, 2026 - [4745 Walnut St](https://nearbypermits.com/boulder/address/4745-walnut-st/): newest permit Aug 11, 2025 - [4760 Walnut St](https://nearbypermits.com/boulder/address/4760-walnut-st/): newest permit Nov 19, 2024 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 22:54 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 13 permits at this address: https://nearbypermits.com/boulder/address/3720-walnut-st/