3318–3330 20th Street

1. 1920

   Built as an industrial building, recorded as occupied by National Radio Co., makers of military-grade HF/VHF radios. Designed by Henry C. Smith.

   Showplace Square / Northeast Mission Historic Resource Survey, adopted 2011
2. Feb 1984

   Permit 8401760 $$$ $2,500

   Foundation changes.

3. Dec 1999

   Permit 9926360 $$$ $1,000

   Interior non struct. demolition.

4. Jan 2000

   Permit 9926910 $$$ $60,000

   Voluntary seismic upgrade/voluntary accessibility upgrade.

5. Nov 2003

   Permit 200311200712 $$$ $100

   For final inspection only 9926910.

6. Jun 2017

   Issued Permit 201706088831 $$$ $1

   Administrative permit to document and memorialize 16, 376 sq ft of trade shop. no construction under this permit. mezzanine level previously approved for office and storage under bpa 275605.

7. Aug 2017

   Filed Permit 201708043948 $$$ $600,000

   Change of use from trade shop to restaurant & retail work limited to sw corner of building. adj. tenant space nic. conditional use authorization per permit application 2017.006766cua as per mission interim controls. ** maher: n/a **.

8. Dec 2022

   Permit 202212198662 $$$ $47,200

   Tenant improvement of existing space into pottery studio with kiln. new sinks. no exterior work.

9. Jul 2024

   Issued Permit M1233987 $$$ $280

   Per permit application 0992690 & 202212198662, add address to new ti at 587 shotwell at apn 3594/011. approval by building inspector j.o.

10. Jun 2025

    Permit 202506027710 $$$ $6,000

    New stairs from mezzananine to first floor.

11. Mar 2026

    Permit 202603127481 $$$ $1

    Revision to permit application 202506027710 to add new detail for steel column to be supported by existing footing add special inspection item. bolts installed in existing concrete.

12. Jul 2026

    Filed Permit 202607295746

    Please update scope of work & construction cost. thanks.

3 expired permits are omitted. The roll classes this parcel as a vacant lot and also gives it a build year of 1920.