421 Leavenworth Street

1. 1913

   Built as apartment building with 48 2- and 3-room units, to the design of the architects Rousseau & Rousseau. Five storeys over a basement, steel frame and reinforced brick structure, two-part vertical composition, Renaissance/Baroque ornamentation.

   National Register of Historic Places nomination, National Park Service
2. Aug 1982

   Permit 8207056 $$$ $24,000

   Additions alterations or repairs.

3. Nov 1983

   Permit 8311040 $$$ $484,325

   Extensive rehab to comply with rap.

4. Jul 1997

   Permit 9713592 $$$ $20,000

   Reroofing.

5. Jan 2000

   Permit 20000111821 $$$ $603,109

   Bathrooms & kitchens remodel.

6. Mar 2001

   Permit 200103194564 $$$ $300

   Unreasonable hardship request one unit provid 2 33" straight grab bar to gain addtnl length in liu of.

7. May 2001

   Permit 200105108850 $$$ $15,000

   Installing of fire alarm system.

8. Jan 2004

   Permit 200401204334 $$$ $18,000

   Repair fire damage in upper unit, hallway, stairwell and roof.

9. Oct 2011

   Permit 201110267679 $$$ $2,500

   Remove rusted out fire escape ladder. replace with new ladder (galvanized) install additional ladder guide stabilizer.

10. Apr 2015

    Permit 201504173996 $$$ $28,000

    Install fire sprinkler system, (10) total fire sprinklers + underground, no associated building permit.

11. Apr 2017

    Permit 201704123792 $$$ $5,600

    Add on to existing system. install new monitor modules for new waterflow & tamper switches in the trash room on 1st thru 6th fls. new monitor modules will be tie-in to existing control panel located on 1st permit application 201504173996 maher na.

12. May 2023

    Issued Permit 202305057244 $$$ $10,000,000

    Priority processing-100% affordable. 47 units+community room+offices. fire restoration & voluntary seismic. grd floor reconfiguration. in-kind stair repair/replacement. window repair/replace, door replace, new mep, hvac, exhaust, fixtures, appliances, mobility+communication units. historic facade remain.

13. Dec 2023

    Permit 202312132481 $$$ $1

    For administrative purposes to verify building use as 47 units, one office manager and community room per city records and sq ft bid site visit.

14. Jul 2025

    Issued Permit 202507030136 $$$ $5,000

    To install a new 6" di underground fire line to area below grade. (ref permit application 202305057244).

15. Sep 2025

    Issued Permit 202508183258 $$$ $475,000

    Proposed fire sprinkler work is to install a complete operational speaker system for full coverage of the rehabilitated 47 public housing apartment and community room. ref #202305057244.

16. Sep 2025

    Unknown Permit 202509054717 $$$ $129,193

    Installation of a new fire alarm and detection system. in 100% affordable housing project with priority permit processing under mayor's executive directive ed 13-01. ref permit application 202305057244.

17. Sep 2025

    Issued Permit 202509054721 $$$ $13,587

    Installation of a new two way communication signal system in a 100% affordable housing project with priorty permit processing under mayor's executive directive ed 13-01. ref permit application 202305057244.

18. Apr 2026

    Issued Permit 202604229895 $$$ $15,000

    Install new fence at rear west property line. no mep, facade work or in public right of way.

19. Jun 2026

    Permit 202606022308 $$$ $1,800

    Install evacuation maps on floors 1-6.

DBI holds 31 permits for this parcel, most of them tenant improvements on individual floors. The timeline shows the 24 largest by stated cost, plus the earliest on file; the DBI query in the sources below returns all 31. 4 of them are nominal $1 street-space or sidewalk permits. 6 expired or cancelled permits are not shown.