Building permit intelligence · Boston, MA
100 Blossom St has 86 municipal building permits on file in Ward 3. The latest recorded activity was a intext permit dated Apr 17, 2026. Permits at this address represent $5MM–$25MM in total declared construction value. PropertyLabs also identified 1 mapped permit within 500 m of this address.
Interior/Exterior Work
Interior/Exterior Work
Renovations - Interior NSC
Renovations - Interior NSC
Renovations - Interior NSC
Electrical
1 mapped permit within 500 m, shown on the intelligence map above.
7 other addresses on Blossom St with municipal permit records in Boston.
This address has 86 permit records in PropertyLabs' public history and is located in Ward 3. The city figures below provide context without changing the focus of this exact-address record.
City coverage counts address-linked rows and does not add overlapping canonical tables. Rolling windows are inclusive, use UTC boundaries, and end Aug 1, 2026.
PropertyLabs compiled this permit history from municipal public records for Boston, MA. The latest recorded permit activity at 100 Blossom St is dated Apr 17, 2026. Municipal records can be corrected or updated after publication.
See the contractors, applicants, permit holders, permit numbers, and project documents associated with 100 Blossom St in the PropertyLabs platform, along with alerts when new permits are filed at this address.
The project scope includes demo of the existing generator, repositioning of the former generator room into a new emergency electric room, demolition of fuel oil lines throughout th…
Low Voltage
Low Voltage
Low Voltage
Electrical
Renovations - Interior NSC
Run 3" conduit from EP2-1 to ATS 10046. Install 250a breaker. No bldg permit tied to project as this is the total scope. E24054 MGH Cox Bldg EM.
Electrical
Renovations - Interior NSC
Renovations - Exterior
Electrical
Low Voltage
Renovations - Interior NSC
Electrical
Low Voltage
Electrical
Renovations - Interior NSC
Electrical
Renovations - Interior NSC
Renovations - Interior NSC
Renovations - Exterior
Installation of the Med Gas Zone Valve Box on an existing patient floor.
21-0071-10 154 Blossom St- MGH Cox 4 Biomed Workshop Low voltage T/D cabling
MGH Cox 4 Biomed Workshop, 100 Blossom St. Misc. Low Voltage HVAC Control Wiring - FGK - 219548
Interior Renovation to an existing Biomed machine shop. Scope of work included new HVA system, Electrical work, FA work, Plumbing;and Sprinkler work. Finish work includes new walls…
Interior Demo to an Existing machine shop. Remove Walls, and Ceilings along MEP. This is linked to ALT1164342 and the project costs / other permits are captured under that #.
New power and lighting for the renovation of the biomed workspace on the 4th floor of the Cox Building. Add a new 225A panelboard.
New fire alarm devices for the renovation of the biomed workspace on the 4th floor of the Cox Building.
Install of new hand sink
Hospital, Medical Exam and Clinic; Certificate for;New Outpatient Department for Substance Abuse- 1st.fl. - Only Alt 920833 issued 2/13/19
Job# 19-0608-10 MGH-Blake II in patient Psych-Low Voltage T/D cabling-11th fl
MGH Blake 9 - IDF Closets low voltage HVAC control wiring - 197895 - JG
MGH admitting Project - low voltage HVAC control wiring - 197924 - JG
MGH Blake Basement Jackson Pharmacy; low voltage HVAC control wiring 197830 JAG
Renovation to existing Psychiatric Unit including new flooring, ceiling, millwork, Fire Protection, Mechanical, Fire alarm ,Electrical &; Plumbing upgrades to clinical entrance/vis…
Renovation of existing space. (E19087 MGH Blake 11)
Renovation of existing spaces(E19087-MGH Blake 11)
884965 - MGH Blake 11 Upgrades Staff Restroom and kitchenette upgrade.
MGH Blake 9 Cath Lab Renovation, low voltage HVAC control wiring - JG, 197560
MGH Blake - 290 Waiting Room, Misc low voltage HVAC control wiring - JAG, 197430
Job# 19-0210-10- MGH 154 Blossom Street, 1st Fl LV T/D Cabling COX
MGH Cox -1 Outpatient, Misc low voltage HVAC control wiring - FK, 197087
MGH Cox Fire Alarm, Misc low voltage HVAC control wiring - FGK, 197064
Job# 18-0324-10 MGH Blake Bldg 2nd Fl waiting, low voltage T/D cabling
Renovations to MGH Cox building 1st floor into outpatient department
Demo & Reno of existing patient exam rooms & offices on the Cox building 1st floor @
Demo & Reno of existing patient exam rooms & offices on the Cox building 1st floor
Demo & Reno of existing patient exam rooms & offices on the Cox building 1st floor
Renovations to part of the 1st floor of the MGH Cox Building. Scope includes renovating existing clinical space to create a new Outpatient Department for Substance Abuse. Project i…
Installation of new FA riser closet in the Cox building(10flrs). Includes added lighting, power, mech. equip & panelboards @ 100 Blossom Street, Boston - Cox Building
Installation of new FA riser closet in the Cox building(10flrs). Includes added lighting, power, mech. equip & panelboards @ 100 Blossom Street, Boston - Cox Building. (2) 120/208V…
Mass General Hospital - Cox Building -; Renovation of the Fire Alarm infrastructure on all floors of the Cox Building.; Spaces will have;all new Fire Alarm closets on each floor, a…
MGH Cox 7 - Sterilizer, Misc low voltage HVAC control wiring - JAG, 186305
Electrical upgrades for MGH Cox 7 Drystream Project
Mass General Hospital - Cox Building 7th floor - Hospital Renovations. Work to include replacement of existing sterilizer including new drywall partitions, ACT, lighting, flooring,…
MGH Cox Basement Renovation, Misc Low Voltage HVAC Control Wiring - FGK, 185493
Installing two sinks in the basement of MGH Cox
Renovation of an existing area(MGH Cox Basement-3 Phases)
MGH - Cox Basement; -; Renovations of existing CT treatment area including new millwork, ceiling and flooring, ACT, modify existing MEP's, Fire Alarm &; Sprinkler systems
Hospital C/O-For;Offices, Exam Rooms &; Waiting Room (First Floor) alt 688678 issued 3/27/17
MGH Cox-1 Neuroendocrine, Misc. Low Voltage HVAC Control Wiring - FK, 174632
Renovation of existing patient exam rooms & office on the Cox building 1st fl, (1) 120/208V 42 Circuit Panel board
Renovation of existing patient exam rooms & offices on the Cox Building 1st fl
371500 - MGH Cox 1 - First floor renovation adding a 1 water cooler, 2 sinks, 1 mop sink, 1 coffee maker, and 1 Ice maker line.
Interior renovation.Supply all labor and materials to renovate the first floor per drawings and specifications by NBBJ Architects and Thompson Consulting Enginners including interi…
Cox Building 2nd fl- Small renovation project, installation of air compressor
Cox Building 2nd fl. Small renovation project, installation of heats and modules for pre-action system re-placement
Replacing sprinkler piping and heat detectors along with one pull station.
MGH Cox Lighting Replacement, Retrofit Existing Lighting Fixtures - AP, 163389
Hospital, Medical Exam and Clinic doc# 671/2007; C/O for; Offices,;Conference Rms, Common areas, Kitchen &; Administrative Spaces;on the 3rd floor of MGH/Cox Bldg. ALT403851, issue…
Hospital, Medical Exam and Clinic doc# 671/2007; Temporary C/O for Phase 1 &; 2A; Offices.; Adding Phase 2B; offices;on the 3rd floor of MGH/Cox Bldg. TCO valid for 90 days; 11/19/…
MGH-Cox 3: Low-Voltage Stubs/Boxes and cable for (5) Door Contacts & (4) Panic Switch.
COX 3 - replace Fire Alarm System
COX 3 Electrical Fit Out
MGH Cox Building 3rd Floor Renovation. Install low voltage control wiring to HVAC Equipment for the purpose of temperature control. #141678 rc
345200 - Installation of 3 Water Closets, 3 Lavatories, 1 Mop Basin, and 1 sink per the engineered drawings.
MGH - Cox Bldg - 3rd Floor -; Renovations;including interior demolition and construction of new Offices, Conference Rooms, Bathrooms, Kitchenette and Administrative spaces and asso…
Remove existing singleply roof and install new singleply membrane roof.
install a dedicated circuit and power pole in Cox Building 8th floor room 840
Mobilization, containment set-up, removal and disposal of ACM carpet, vinyl and sheet flooring materials from Cox Building 5th Floor area only.