50 Hawthorne Street

1. Nov 1990

   General alteration & t.i., demolition, const int architectur.

   Complete Permit 9023883 $$$ $300,000
2. Sep 2012

   Remove existing precast concrete facade & install new curtain wall system, revisions to entrance lobby layout & 1st fl toilet rm layout, relocate exterior entrance stair & revise garden court layout. no increase in office space.

   Issued Permit 201209280892 $$$ $735,000
3. Apr 2014

   3rd floor: t.i. work including new partitions, door and ceilings and millwork. mechanical electrical structural. life safety and sprinklers under seperate permit.

   Complete Permit 201404082673 $$$ $1,171,320
4. Apr 2014

   Interior tenant improvement on the 2nd floor including new partitions, doors, & ceilings, millwork, mechanincal, electrical, structural, ls & sprinklers under seperate permit.

   Complete Permit 201404082675 $$$ $1,171,320
5. Apr 2014

   Interior tenant improvement on first floor including new partitions, doors, ceilings and millwork. mechanical, electrical, structural, life safety & sprinklers under seperate permit.

   Complete Permit 201404082674 $$$ $1,000,920
6. Apr 2014

   Structural work associated with approved app#201404082673 and 201404082675 including stair and platform.

   Complete Permit 201404183653 $$$ $625,000
7. Apr 2014

   New roof deck on existing roof, extension of existing stairs & new elevator from 3rd floor to roof, structural work under seperate permit.

   Complete Permit 201404213718 $$$ $696,300
8. Apr 2014

   Structural work associated with approved permit application 201404213718 & 201404082673, elevator shaft.

   Complete Permit 201404284302 $$$ $90,000
9. Apr 2014

   Mechanical and electrical work associated with 201404082675 including new vav boxes, fans, heat pumps, lighting.

   Complete Permit 201404304619 $$$ $675,000
10. Apr 2014

    Mechanical and electrical work associated with 201404082673 including new vav boxes, fans, heat pumps, lighting.

    Complete Permit 201404304620 $$$ $675,000
11. Apr 2014

    Mechanical and electrical work associated with 201404082674 including new vav boxes, fans, heat pumps, lighting.

    Complete Permit 201404304617 $$$ $490,000
12. Jul 2014

    Relocate 37 pendent sprinklers & 1 upright on 1/f. relocate 29 pendent sprinklers & 9 uprights on 2/f. relocate 39 pendent sprinklers & 7 uprights on 3/f. t.i. permit application 201404082673, 201404082674 & 201404082675.

    Complete Permit 201407030445 $$$ $63,860
13. Nov 2017

    1, 2, 3 floors: interior demolition of partitions, doors, glazing, millwork and finishes. space to remain vacant per ab-017 and ada will be addresses on future ti permit. no exterior work.

    Complete Permit 201711204363 $$$ $315,000
14. Dec 2017

    3rd fl ti. partial demolition of partitions. new partitions. mep. new finishes. fire safety under seperate permit.

    Complete Permit 201712217137 $$$ $1,200,000
15. Dec 2017

    2nd fl ti. partial demolition of partitions. new partitions. mep. new finishes. fire safety under seperate permit.

    Complete Permit 201712217138 $$$ $1,200,000
16. Dec 2017

    1st fl ti. partial demolition of existing partitions. new partitions. mep. new finishes, new louver on 1st floor level (kaplan) to provide ventilation for new showers. fire safety under seperate permit.

    Issued Permit 201712217139 $$$ $1,200,000
17. Feb 2018

    1, 2, 3 floor -existing fire sprinkler 62 relocate pendents, 98 added pendents, 59 relocate sprinklers upright, 29 added uprights, 41 plugged outlets- bracing verified, new hyraclice calc's for first floor protection aboive and below ceiling.

    Issued Permit 201802282439 $$$ $93,750
18. Nov 2019

    1st floor: demolition construction of partitions, glazing, millwork, doors, & finishes on existing t.i. mep on seperate permit. maher n/a.

    Complete Permit 201911268213 $$$ $172,773
19. Jan 2020

    T-24 to install new ductwork and hvac equipment, power and lighting phase refer to pa 2019-1126-8213 for ti work on 1st fl.

    Complete Permit 202001081485 $$$ $65,670
20. Feb 2020

    Fire alarm on 1st fl: add 3 notification appliances and relocate 1 notification appliance, add 1 smoke detector in fire alarm system 1st fl 201911268213.

    Issued Permit 202002285667 $$$ $100,000
21. Feb 2026

    Stair infill from floors 1-3 in vacant commercial building. new concrete floor infill & supporting structure at openings.

    Cancelled Permit 202602025014 $$$ $350,000
22. Mar 2026

    All floors: interior tenant improvement to include non-structural partitions, new ceilings, and associated electrical, lighting, plumbing, and new finishes throughout area of work. new millwork elements and new furniture. mep, fire life safety to be deferred submittal.

    Issued Permit 202603187875 $$$ $940,000
23. Apr 2026

    3rd floor interior tenant improvement to include new barista bar serving coffee, tea and grab & go prepackaged food. new back of house catering area.

    Issued Permit 202604270180 $$$ $48,000
24. May 2026

    L1-3: deferred mep for permit application 202603187875.

    Issued Permit 202605261919 $$$ $713,232

DBI holds 62 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 62. 7 of them are nominal $1 street-space or sidewalk permits.