# Building permits at 4765 Walnut St, Boulder, CO 60 permits on record here. The newest, Sep 24, 2025: Tenant improvement project for 4765 walnut st. 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 24, 2025 | Alteration or repair | Tenant improvement project for 4765 walnut st, suite c. Existing suite to receive mechanical, electrical, and fire protection upgrades for the installation of tenant specialty equipment for the assembly of satelites. | $618,593 | [BLD-NRE2025-00091](https://nearbypermits.com/boulder/permit/BLD-NRE2025-00091/) | | Aug 26, 2025 | Fire systems | Tenant Improvement to existing space. Suite C (FATI) | $11,203 | [FIR2025-00319](https://nearbypermits.com/boulder/permit/FIR2025-00319/) | | Aug 20, 2025 | Fire systems | Frontier to provide coverage to added rooms at existing warehouse. Existing upright coverage to remain. Added Clean room will be fed with flex heads, hydraulic calculations provided. (FSR13) | $13,763 | [FIR2025-00303](https://nearbypermits.com/boulder/permit/FIR2025-00303/) | | Jul 15, 2025 | Alteration or repair | Interior alteration of 4765 walnut, suite c. Scope of work is limited to demolition and replacement of concrete slab of total area of approximately 18 square feet. New, reinforced concrete slab will support a vibration table. | $5,000 | [BLD-NRE2025-00086](https://nearbypermits.com/boulder/permit/BLD-NRE2025-00086/) | | Jul 19, 2023 | Fire systems | Additions / alterations to the existing wet pipe fire sprinkler system to accommodate a tenant finish to create a move-in ready office. See BLD-NRE2023-00009 for general building permit. 4765 Walnut spec suite c (fsr13) | $12,995 | [FIR2023-00259](https://nearbypermits.com/boulder/permit/FIR2023-00259/) | | Jul 10, 2023 | Fire systems | Additions / alterations to the existing fire alarm system to accommodate a tenant remodel in existing sprinkled bldg. Existing addressable Notifier NFS2-3030 with voice evac. Installation of seven new speaker/strobes. See BLD-NRE2023-00009 for general building permit. 4765 Walnut spec ti unit c (fat | $3,600 | [FIR2023-00244](https://nearbypermits.com/boulder/permit/FIR2023-00244/) | | Jun 27, 2023 | Alteration or repair | Unit C: Remodel of 9,048 SF tenant suite in existing 27,943 SF building to create move-in ready unit. Minor reconfiguration of space, new finishes, mechanical distribution added to existing HVAC units, new lighting and other electrical work, and sprinkler system reconfiguration. | $478,814 | [BLD-NRE2023-00009](https://nearbypermits.com/boulder/permit/BLD-NRE2023-00009/) | | Mar 7, 2022 | Electrical | Provide 6 new circuits, provide 7 new receptacles, replace 7 receptacles, add 2 - 3-phase circuits for workstations | $4,000 | [ELE2022-00229](https://nearbypermits.com/boulder/permit/ELE2022-00229/) | | Jul 28, 2021 | Fire systems | Modify existing addressable fire alarm system to provide full occupant notification throughout the listed TI area. New area will be standard notification not voice evac. Voice evac not required in this building, it is left over from the previous tenant (Amgen). Occupancy going from Ordinary Hazard t | $7,429 | [FIR2021-00257](https://nearbypermits.com/boulder/permit/FIR2021-00257/) | | Jul 20, 2021 | Plumbing | Renovation of the existing labs and office in suite A. To include 3 new RTUs on the existing roof to serve the space mechanically as required for BSL-2 requirements. Related to FLD2021-00026. | $64,940 | [PLB2021-00209](https://nearbypermits.com/boulder/permit/PLB2021-00209/) | | Jul 20, 2021 | Mechanical (HVAC) | Renovation of the existing labs and office in suite A. To include 3 new RTUs on the existing roof to serve the space mechanically as required for BSL-2 requirements. Related to FLD2021-00026. | $538,720 | [MEC2021-00597](https://nearbypermits.com/boulder/permit/MEC2021-00597/) | | Jul 20, 2021 | Roofing | Renovation of the existing labs and office in suite A. To include 3 new RTUs on the existing roof to serve the space mechanically as required for BSL-2 requirements. Related to BLD-NRE2021-00045. | $1,252,340 | [FLD2021-00026](https://nearbypermits.com/boulder/permit/FLD2021-00026/) | | Jul 20, 2021 | Electrical | Renovation of the existing labs and office in suite A. To include 3 new RTUs on the existing roof to serve the space mechanically as required for BSL-2 requirements. Related to FLD2021-00026. | $280,750 | [ELE2021-00497](https://nearbypermits.com/boulder/permit/ELE2021-00497/) | | Jul 20, 2021 | Alteration or repair | Renovation of the existing labs and office in suite A. To include 3 new RTUs on the existing roof to serve the space mechanically as required for BSL-2 requirements. Related to FLD2021-00026. Resubmitted for addition of water heater and other small changes in scope | $1,252,340 | [BLD-NRE2021-00045](https://nearbypermits.com/boulder/permit/BLD-NRE2021-00045/) | | Jun 23, 2021 | Demolition | Interior non-structural demolition associated with BLD-NRE2021-00045 | Not listed | [DEM2021-00044](https://nearbypermits.com/boulder/permit/DEM2021-00044/) | | Jun 18, 2021 | Fire systems | Relocate 74 pendants, 9 sidewalls and 2 uprights to remain. Plug off 62 existing 1" outlets. Occupancy going from Ordinary Hazard to Light Hazard. See BLD-NRE2021-00045 for general building permit. See FIR2021-00257 for fire alarm permit. Umoja biopharma | $12,900 | [FIR2021-00197](https://nearbypermits.com/boulder/permit/FIR2021-00197/) | | Apr 17, 2020 | Roofing | *219 squares of rubber overlay on a pitch represented as | $145,000 | [RFG2020-00212](https://nearbypermits.com/boulder/permit/RFG2020-00212/) | | Aug 5, 2019 | Electrical | Electrical subpanel and transformer installation, provide power to new RTUs. See also MEC2018-01356. All new and replaced electrical equipment shall be 2.5 feet above finished floor. | $12,500 | [ELE2018-01129](https://nearbypermits.com/boulder/permit/ELE2018-01129/) | | Jul 2, 2019 | Sign | Building permit to re-establish life-safety compliance for areas outside of Suite B remodel scope submitted under separate permit (BLD-NRE2019-00026, Outdoor lighting plan included with that permit). Actual work limited to modifications to exit signage and lighting. This permit is associated with BL | $11,135 | [FLD2019-00054](https://nearbypermits.com/boulder/permit/FLD2019-00054/) | | Jul 2, 2019 | Fire systems | Design and install fire sprinkler system per submittal drawing. | $49,000 | [FIR2019-00221](https://nearbypermits.com/boulder/permit/FIR2019-00221/) | | Jul 2, 2019 | Electrical | *Voided for inactivity - no inspections within 180 days* Building permit to re-establish life-safety compliance for areas outside of Suite B remodel scope submitted under separate permit (BLD-NRE2019-00026). Actual work limited to modifications to exit signage and lighting. | $3,000 | [ELE2019-00386](https://nearbypermits.com/boulder/permit/ELE2019-00386/) | | Jul 2, 2019 | Alteration or repair | *Voided for inactivity - no inspections within 180 days* Building permit to re-establish life-safety compliance for areas outside of Suite B remodel scope submitted under separate permit (BLD-NRE2019-00026, Outdoor lighting plan included with that permit). Actual work limited to modifications to exi | $11,245 | [BLD-NRE2019-00077](https://nearbypermits.com/boulder/permit/BLD-NRE2019-00077/) | | May 24, 2019 | Mechanical (HVAC) | Installation of new RTUs. *Scope updated 3/4/19 to remove (2) of the (6) proposed RTU's to be installed. Total number of RTU's to be installed is (4). | $48,500 | [MEC2018-01356](https://nearbypermits.com/boulder/permit/MEC2018-01356/) | | May 24, 2019 | Alteration or repair | *Voided for inactivity - no inspections within 180 days* Building permit for structural reinforcement scope associated with MEC2018-01356. | $22,398 | [BLD-NRE2019-00048](https://nearbypermits.com/boulder/permit/BLD-NRE2019-00048/) | | May 17, 2019 | Plumbing | Interior tenant remodel of a technical office suite on two levels. Scope includes reconfigured private offices, conference rooms, new water heater, new rooftop units, and associated MEP scope. Associated with Floodplain development permit FLD2019-00021. | $8,000 | [PLB2019-00081](https://nearbypermits.com/boulder/permit/PLB2019-00081/) | | May 17, 2019 | Mechanical (HVAC) | Interior tenant remodel of a technical office suite on two levels. Scope includes reconfigured private offices, conference rooms, new water heater, new rooftop units, and associated MEP scope. Associated with Floodplain development permit FLD2019-00021. | $70,000 | [MEC2019-00191](https://nearbypermits.com/boulder/permit/MEC2019-00191/) | | May 17, 2019 | Electrical | Interior tenant remodel of a technical office suite on two levels. Scope includes reconfigured private offices, conference rooms, new water heater, new rooftop units, and associated MEP scope. Associated with Floodplain development permit FLD2019-00021. | $65,000 | [ELE2019-00137](https://nearbypermits.com/boulder/permit/ELE2019-00137/) | | May 17, 2019 | Alteration or repair | Interior tenant remodel of a technical office suite on two levels. Scope includes reconfigured private offices, conference rooms, new water heater, new rooftop units, and associated MEP scope. Associated with Floodplain development permit FLD2019-00021. Outdoor lighting plan included. | $400,000 | [BLD-NRE2019-00026](https://nearbypermits.com/boulder/permit/BLD-NRE2019-00026/) | | May 15, 2019 | Alteration or repair | Floodplain Development permit for the interior remodel of an existing office tenant suite on two levels. associated with BLD-NRE2019-00026 | $400,000 | [FLD2019-00021](https://nearbypermits.com/boulder/permit/FLD2019-00021/) | | May 14, 2019 | Fire systems | Tenant remodel on two levels in existing sprinkled building. See BLD-NRE2019-00026 for general building permit. 1St crop. | $11,000 | [FIR2019-00163](https://nearbypermits.com/boulder/permit/FIR2019-00163/) | | May 8, 2019 | Fire systems | 19-head tenant finish in existing office building. See BLD-NRE2018-00026 for general building permit. First crop | $1,040 | [FIR2019-00152](https://nearbypermits.com/boulder/permit/FIR2019-00152/) | | Jan 9, 2019 | Electrical | *Voided for inactivity - no inspections within 180 days* Installation of new RTUs, Electrical subpanel and transformer installation, provide power to new RTUs. See MEC2018-01356 and ELE2018-01129. | $85,000 | [FLD2018-00131](https://nearbypermits.com/boulder/permit/FLD2018-00131/) | | Sep 25, 2018 | Plumbing | *Voided for inactivity - no inspections within 180 days* Permit for interior non-structural demolition of almost all interior partitions in the north and SE sections of the main level of an existing office building, along with removal of existing medical and mechanical equipment, and removal of drop | $25,000 | [PLB2018-00387](https://nearbypermits.com/boulder/permit/PLB2018-00387/) | | Sep 25, 2018 | Mechanical (HVAC) | *Voided for inactivity - no inspections within 180 days* Permit for interior non-structural demolition of almost all interior partitions in the north and SE sections of the main level of an existing office building, along with removal of existing medical and mechanical equipment, and removal of drop | $50,000 | [MEC2018-00915](https://nearbypermits.com/boulder/permit/MEC2018-00915/) | | Sep 25, 2018 | Other | *Voided for inactivity - no inspections within 180 days* Floodplain development permit for an interior non-structural demolition of an existing office suite to prepare the suite for design for a future tenant finish under separate permit. | $150,000 | [FLD2018-00082](https://nearbypermits.com/boulder/permit/FLD2018-00082/) | | Sep 25, 2018 | Electrical | *Voided for inactivity - no inspections within 180 days* Permit for interior non-structural demolition of almost all interior partitions in the north and SE sections of the main level of an existing office building, along with removal of existing medical and mechanical equipment, and removal of drop | $25,000 | [ELE2018-00765](https://nearbypermits.com/boulder/permit/ELE2018-00765/) | | Sep 25, 2018 | Alteration or repair | *Voided for inactivity - no inspections within 180 days* Permit for interior non-structural demolition of almost all interior partitions in the north and SE sections of the main level of an existing office building, along with removal of existing medical and mechanical equipment, and removal of drop | $215,016 | [BLD-NRE2018-00121](https://nearbypermits.com/boulder/permit/BLD-NRE2018-00121/) | | Jun 5, 2017 | Electrical | CONDITIONAL WETLAND PERMIT to replace/relocate an existing, underground, utility (electrical) line. | Not listed | [PMT2017-02198-WET](https://nearbypermits.com/boulder/permit/PMT2017-02198-WET/) | | Sep 23, 2009 | Fire systems | Tennant Finish Fire Alarm For Amgen AC-7 | Not listed | [PMT2009-03769-FIR](https://nearbypermits.com/boulder/permit/PMT2009-03769-FIR/) | | Sep 9, 2009 | Plumbing | Tenant Remodel - To convert approximately 1,200 sf of mail room space to laboratory space. Includes electrical, mechanical, and minor plumbing (no new fixtures). | $16,700 | [PMT2009-03004-PLB](https://nearbypermits.com/boulder/permit/PMT2009-03004-PLB/) | | Sep 9, 2009 | Mechanical (HVAC) | Tenant Remodel - To convert approximately 1,200 sf of mail room space to laboratory space. Includes electrical, mechanical, and minor plumbing (no new fixtures). | $3,600 | [PMT2009-03004-MEC](https://nearbypermits.com/boulder/permit/PMT2009-03004-MEC/) | | Sep 9, 2009 | Electrical | Tenant Remodel - To convert approximately 1,200 sf of mail room space to laboratory space. Includes electrical, mechanical, and minor plumbing (no new fixtures). | $9,300 | [PMT2009-03004-ELE](https://nearbypermits.com/boulder/permit/PMT2009-03004-ELE/) | | Sep 9, 2009 | Alteration or repair | Tenant Remodel - To convert approximately 1,200 sf of mail room space to laboratory space. Includes electrical, mechanical, and minor plumbing (no new fixtures). | $82,362 | [PMT2009-03004](https://nearbypermits.com/boulder/permit/PMT2009-03004/) | | Aug 31, 2009 | Fire systems | Tennant Finish Sprinkler Amgen | $1,000 | [PMT2009-03405-FIR](https://nearbypermits.com/boulder/permit/PMT2009-03405-FIR/) | | May 20, 2009 | Electrical | Electrical work assocaited with the removal of an existing 400 amp chiller circuit and installation/modification of switchgear & new wiring for preparation & installation of a replacement 600 amp chiller unit. Mechanical work by separate permit. | $20,000 | [PMT2009-01656-ELE](https://nearbypermits.com/boulder/permit/PMT2009-01656-ELE/) | | Dec 8, 2008 | Mechanical (HVAC) | Emergency generator tank venting and overfill protection devices to existing system. | $8,817 | [PMT2008-05332-MEC](https://nearbypermits.com/boulder/permit/PMT2008-05332-MEC/) | | Feb 7, 2007 | Fire systems | Fire Alarm System - AC-5 | $30,000 | [PMT2006-05128-FIR](https://nearbypermits.com/boulder/permit/PMT2006-05128-FIR/) | | Oct 18, 2006 | Fire systems | Fire Sprinkler System - AC-5 (Catwalks) | $14,500 | [PMT2006-04465-FIR](https://nearbypermits.com/boulder/permit/PMT2006-04465-FIR/) | | Oct 5, 2006 | Electrical | Electrical maintenance & renovation of AMGEN facility, addition of new sub-panels and associated circuits, additional lights, & outlets. | $200,000 | [PMT2006-04058-ELE](https://nearbypermits.com/boulder/permit/PMT2006-04058-ELE/) | | Sep 26, 2006 | Mechanical (HVAC) | Rehabilitation of mechanical equipment, ventilation equipment, replacement of water heaters, RTUs, reconfiguration of some ductwork, scope of work throughout building. | $575,000 | [PMT2006-04146-MEC](https://nearbypermits.com/boulder/permit/PMT2006-04146-MEC/) | | May 30, 2002 | Mechanical (HVAC) | Installation of concrete pad and two gas tanks (nitrogen and argon) at the Amgen facility. [Already built. See ADR2002-00059 for minor modification approval]. | $16,000 | [PMT2002-02224-MEC](https://nearbypermits.com/boulder/permit/PMT2002-02224-MEC/) | | May 30, 2002 | Alteration or repair | Installation of concrete pad and two gas tanks (nitrogen and argon) at the Amgen facility. [Already built. See ADR2002-00059 for minor modification approval]. | $26,000 | [PMT2002-02224](https://nearbypermits.com/boulder/permit/PMT2002-02224/) | | Apr 25, 1995 | Alteration or repair | Interior remodel labs 102 & 105 the original general permit number is 953083. | Not listed | [PMT1995-03083-FLD](https://nearbypermits.com/boulder/permit/PMT1995-03083-FLD/) | | Apr 25, 1995 | Alteration or repair | Interior remodel labs 102 & 105 the original general permit number is 953083. | $320,000 | [PMT1995-03083](https://nearbypermits.com/boulder/permit/PMT1995-03083/) | | Apr 6, 1995 | Demolition | Demolish non- load-bearing / For labs 102 & 105. | Not listed | [PMT1995-02530-DEM](https://nearbypermits.com/boulder/permit/PMT1995-02530-DEM/) | | May 17, 1994 | Alteration or repair | Remodel existing laboratories the original general permit number is 943478. | Not listed | [PMT1994-03478-FLD](https://nearbypermits.com/boulder/permit/PMT1994-03478-FLD/) | | May 17, 1994 | Alteration or repair | Remodel existing laboratories the original general permit number is 943478. | $125,000 | [PMT1994-03478](https://nearbypermits.com/boulder/permit/PMT1994-03478/) | | Nov 15, 1990 | Alteration or repair | Interior rmdl. The original general permit number is r4528. | $750,000 | [PMT1990-R4528](https://nearbypermits.com/boulder/permit/PMT1990-R4528/) | | Nov 15, 1990 | Alteration or repair | Interior remodel the original general permit number is 4528. | $750,000 | [PMT1990-04528](https://nearbypermits.com/boulder/permit/PMT1990-04528/) | | Jul 15, 1988 | Sign | Sign non elec sign | $500 | [PMT1988-M9675-SGN](https://nearbypermits.com/boulder/permit/PMT1988-M9675-SGN/) | ## More on this street Other addresses on Walnut St with permits, nearest house number first: - [4760 Walnut St](https://nearbypermits.com/boulder/address/4760-walnut-st/): newest permit Nov 19, 2024 - [4775 Walnut St](https://nearbypermits.com/boulder/address/4775-walnut-st/): newest permit Mar 17, 2026 - [4745 Walnut St](https://nearbypermits.com/boulder/address/4745-walnut-st/): newest permit Aug 11, 2025 - [4730 Walnut St](https://nearbypermits.com/boulder/address/4730-walnut-st/): newest permit May 21, 2026 - [3750 Walnut St](https://nearbypermits.com/boulder/address/3750-walnut-st/): newest permit Dec 20, 2024 - [3720 Walnut St](https://nearbypermits.com/boulder/address/3720-walnut-st/): newest permit Sep 15, 2026 - [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 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 16:34 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 60 permits at this address: https://nearbypermits.com/boulder/address/4765-walnut-st/