Alteration Commercial
99 Prospect St, Cambridge, MA 02139
ClassificationBuilding: Alteration and AdditionCommercial Alteration
Reliable value$525,000
ContractorYsc
Permit record
Parties
- Contractor
- Ysc
- Applicant
- Thomas Evarts
- Owner
- Not in source
- Architect
- Structures North Consulting Engineers
- Engineer
- Not in source
- Contractor license
- Not in source
Building & lot · PLUTO
- Building class
- Not in source
- Zoning district
- Not in source
- Lot area
- Not in source
- Year built
- Not in source
- Units (total)
- Not in source
- Units (residential)
- Not in source
- Units (commercial)
- Not in source
- Floor area
- 5,000 sq ft
Parcel & enrichment
- Parcel APN
- 107-26
- Climate zone (IECC)
- 5A
- Roof area (est.)
- Not derivable — no building-size signal for this permit
- HVAC tonnage (est.)
- Not derivable — no building-size signal for this permit
- Building type
- B
- Building subtype
- Commercial / Mixed Use
Geocode & dates
- Coordinates
- 42.3677, -71.1025
- Geocode confidence
- 100%
- Geocode source
- Not in source
- Issued
- Mar 13, 2023
- Applied
- Jan 26, 2023
- Work class
- Commercial
Description
Source description
reinforce existing roof trusses with steel angle supplimentary trusses
Status
- Current status
- issued
- Source status
- Active
Provenance
- First seen by PermitCore
- May 18, 2026 · 16:17 UTC
- Last seen
- Aug 6, 2026 · 11:30 UTC
- Last changed
- May 18, 2026 · 16:17 UTC
Data-quality checks0 of 12 flagged
0 of 12 data-quality rules flagged anything on this permit.
Checks not flagged
- Geocode out of bounds
- Geocode is sentinel
- Issued date in the future
- Issued date parse bug
- Issued date is placeholder
- Commercial units is placeholder
- Residential units out of bounds
- Residential units is placeholder
- Total units out of bounds
- Total units is placeholder
- Valuation out of bounds
- Valuation is placeholder
Project timeline at this parcel
- Mar 13, 2023This permitAlteration Commercial · Issued$525,000Ysc
- Apr 27, 2022cambridge_aa_170306Demolition · Issued$1,590,300Folan Waterproofing & Construction CO.
Full permit history at this parcel · as of Jul 8, 2026.
Other permits by Ysc
Developer details
- Permit #
- cambridge_aa_209032
- Canonical ID
- 309:cambridge_aa_209032
- Source permit ID
- cambridge_aa_209032