# Building permits at 321 Mercer St, Seattle, WA The biggest project within a quarter mile since May 1: a $15M alteration or repair at 370 Thomas St, permitted Jun 29. Six permits on record here. The newest, Feb 10: Construct alterations to existing theater building (McCaw Hall). Within a quarter mile, the city has issued 8 more permits since May 1. One is for a new building, 0.24 mi away. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Feb 10, 2026 | New building | Construct alterations to existing theater building (McCaw Hall) per plan. | $15,000 | [7077862-CN](https://nearbypermits.com/seattle/permit/7077862-CN/) | | Dec 17, 2025 | Other | Install monopole for telecommunications facility (Verizon) per plan | $70,000 | [7078810-CN](https://nearbypermits.com/seattle/permit/7078810-CN/) | | Dec 17, 2025 | Alteration or repair | Replace light pole with new light pole with telecommunications equipment (Verizon) at Seattle Center per plan. | $70,000 | [7078804-CN](https://nearbypermits.com/seattle/permit/7078804-CN/) | | Dec 17, 2025 | Alteration or repair | Construct new light pole with minor telecommunications facility (Verizon) per plan. | $70,000 | [7078659-CN](https://nearbypermits.com/seattle/permit/7078659-CN/) | | Sep 19, 2017 | Alteration or repair | Construct alterations to an existing institutional building (McCaw Hall) along the East elevation per plan. | $20,000 | [6570484-CN](https://nearbypermits.com/seattle/permit/6570484-CN/) | | Feb 15, 2017 | Alteration or repair | Alteration to east wall of McCaw Hall to facilitate demolition of an adjacent existing commercial building (Mercer Arena) per plan. | $5,000 | [6579931-CN](https://nearbypermits.com/seattle/permit/6579931-CN/) | ## Within ¼ mi since May 1, 2026 8 permits in the circle. From our copy of the city's data (last 24 months). ### This block (250 to 1,000 ft), 2 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | May 28, 2026 | [225 Roy St](https://nearbypermits.com/seattle/address/225-roy-st/) | 550 ft NW | Alteration or repair | Construct in-kind repairs to water damaged units 2212 2312 2412 and 2515 in existing apartment building subject to field inspection (STFI) | $100,000 | [7145241-CN](https://nearbypermits.com/seattle/permit/7145241-CN/) | | May 1, 2026 | [305 Harrison St](https://nearbypermits.com/seattle/address/305-harrison-st/) | 930 ft S | Addition | Construct addition and alterations to institutional building (The Armory emergency generator vault and renewable energy improvements) per plan. Mechanical included. | $2,000,000 | [7094482-CN](https://nearbypermits.com/seattle/permit/7094482-CN/) | ### Farther (1,000 ft to ¼ mi), 6 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 16, 2026 | [335 Thomas St](https://nearbypermits.com/seattle/address/335-thomas-st/) | 0.24 mi S | New building | Install minor communication "small cell node" utility pole (Verizon) per plan. | $70,000 | [7148933-CN](https://nearbypermits.com/seattle/permit/7148933-CN/) | | Aug 19, 2026 | [440 5th Ave N](https://nearbypermits.com/seattle/address/440-5th-ave-n/) | 0.20 mi SE | Alteration or repair | Construct tenant improvements to existing commercial building (Gates Foundation Discover Center Gallery 6) per plan. | $100,000 | [7148741-CN](https://nearbypermits.com/seattle/permit/7148741-CN/) | | Jul 9, 2026 | [440 5th Ave N](https://nearbypermits.com/seattle/address/440-5th-ave-n/) | 0.20 mi SE | Alteration or repair | Construct tenant improvement to existing gallery space space subject to field inspection STFI. | $100,000 | [7151304-CN](https://nearbypermits.com/seattle/permit/7151304-CN/) | | Jul 7, 2026 | [805 4th Ave N](https://nearbypermits.com/seattle/address/805-4th-ave-n/) | 0.20 mi N | Alteration or repair | Construct tenant improvements to existing multifamily building at levels 1 and 2 per plan. | $650,000 | [7144722-CN](https://nearbypermits.com/seattle/permit/7144722-CN/) | | Jun 29, 2026 | [370 Thomas St](https://nearbypermits.com/seattle/address/370-thomas-st/) | 0.19 mi S | Alteration or repair | Construct alterations to renovate historic Seattle Center Monorail Station per plan. Mechanical work included this permit. | $15,000,000 | [7108199-CN](https://nearbypermits.com/seattle/permit/7108199-CN/) | | Jun 10, 2026 | [800 4th Ave N](https://nearbypermits.com/seattle/address/800-4th-ave-n/) | 0.23 mi NE | Alteration or repair | Construct tenant improvements in residential building at level 1 lobby per plan. | $450,000 | [7138828-CN](https://nearbypermits.com/seattle/permit/7138828-CN/) | ## Zoning requests nearby Hearings are public: you can comment or attend. Dates can move; check the city's page before you go. | Status | Hearing | Address | Distance | Request | Case | City's words | Filed | |---|---|---|---|---|---|---|---| | | | At this address | | Land Use Application to allow a new minor communication utility consisting of 18 antennae dispersed between… | [3043245-LU](https://services.seattle.gov/portal/customize/LinkToRecord.aspx?altId=3043245-LU) | "Issued" | 2025-08-15 | ## More on this street Other addresses on Mercer St with permits, nearest house number first: - [300 Mercer St](https://nearbypermits.com/seattle/address/300-mercer-st/): newest permit Feb 23, 2026 - [500 Mercer St](https://nearbypermits.com/seattle/address/500-mercer-st/): newest permit Dec 2, 2025 - [1201 Mercer St](https://nearbypermits.com/seattle/address/1201-mercer-st/): newest permit Sep 29, 2026 - [1260 Mercer St](https://nearbypermits.com/seattle/address/1260-mercer-st/): newest permit Jul 23, 2026 --- Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr), City of Seattle. Checked 2026-10-08 19:33 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ Zoning requests come from the Seattle land use permits (https://cos-data.seattle.gov/d/ht3q-kdvx), City of Seattle. We read it Oct 8, 17:47 UTC. Map, all 6 permits at this address and 8 nearby: https://nearbypermits.com/seattle/address/321-mercer-st/