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21 Flagg St; Cambridge, MA Property Details

21 Flagg St, Cambridge, MA is a Duplex 2 Units that was built in 1878. This property is currently Financed and is not for sale. Our records show that 21 Flagg St has 6 bedrooms, and 3.5 bathrooms, and a total of 2,607 square feet. The lot size of 21 Flagg St is 3,999 square feet.

Off market
19 Flagg St #21 Cambridge, MA 02138
$2,364,200 Estimated Value
6 Beds
3.5 Baths
2,607 SqFt
Property Details

Summary

  • Purchase Method: Financed
  • Owners / Type: 1 / Individual
  • Owner Status: Individual
  • Year Built: 1878
  • Purchase Price: $391,000
  • Open Loans / Balance: 2 / $121,294
  • Est. Equity / %: $2,017,706 / 94.33%
  • APN: CAMB M:00131 L:00045
  • Situs County: Middlesex City
  • Length Of Ownership: 31 years, 1 months

Rooms

  • Bedrooms: 6
  • Bathrooms: 3.5
  • Full Bathrooms: 3
  • Total Rooms: 11
  • Partial Bathrooms: 1

Structure

  • Building Style: Brick
  • Stories: 2
  • Exterior Wall Type: Wood Siding
  • Building Condition: Good
  • Roof Type: Mansard
  • Roof Cover Type: Slate
  • Deck: true

Measurements

  • Total: 2,607/SqFt
  • Lot: 3,999/SqFt
  • Gross: 4,393/SqFt
  • Living: 2,607/SqFt
  • Basement: 1,487/SqFt
  • Building: 2,607/SqFt
  • Ground: 1,487/SqFt
  • Basement Unfinished: 1,487/SqFt
  • Price Per Square Foot: $149.98
Building Insights

Land Information

  • Property Type: Duplex 2 Units
  • Within Flood Zone: True
  • Flood Zone: X / Low/Medium Risk
  • School District: Cambridge School District
  • Lat / Lon: 42.367905 / -71.11436
  • Property Class: Residential
  • Zoning: C-1
  • County Use Code: 104

Amenities

  • Heating Fuel Type: Gas
  • Plus Four: 6109
  • Cooling: Yes
  • Garage: Garage
  • Heating: Gas
  • Parking: 2

Ownership Info

19 Flagg St #21 has no associated ownership info
19 Flagg St #21 has no associated ownership info.

Taxes

19 Flagg St #21 has 7 associated Taxes items

21 Flagg St, Cambridge, MA pays taxes in Middlesex City County, MA. The most recent tax assessment records are from 2025 and show that the current assessed value of the property is $2,364,200. The APN we've located for 21 Flagg St is CAMB M:00131 L:00045.

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Taxes
  • Assessed Value:  $2,364,200
  • Assessed Year:  2025
  • Assessed County:  Middlesex City
  • APN:  CAMB M:00131 L:00045
  • Assessed Land Value:  1294600
  • Tax Amount:  15013
  • Tax Year:  2025

Tax History

19 Flagg St #21 has 12 associated Tax History items
YearAssessed ValueLand ValueImprovement ValueTax AmountChange RateAssessed CRTax Rate
Year 2025 Assessed Value $2,364,200 Land Value $1,294,600 Improvement Value $1,069,600 Tax Amount $15,013 Change Rate +0.066491% Assessed CR Tax Rate +0.00635%
Year 2024 Assessed Value $2,377,900 Land Value $1,348,300 Improvement Value $1,029,600 Tax Amount $14,077 Change Rate +0.059058% Assessed CR Tax Rate +0.00592%
Year 2023 Assessed Value $2,268,300 Land Value $1,373,300 Improvement Value $895,000 Tax Amount $13,292 Change Rate +0.042101% Assessed CR Tax Rate +0.00586%
Year 2022 Assessed Value $2,154,500 Land Value $1,346,200 Improvement Value $808,300 Tax Amount $12,755 Change Rate +0.038935% Assessed CR Tax Rate +0.00592%
Year 2021 Assessed Value $2,098,600 Land Value $1,320,700 Improvement Value $777,900 Tax Amount $12,277 Change Rate +0.281119% Assessed CR Tax Rate +0.00585%
Year 2020 Assessed Value $2,032,300 Land Value $1,269,000 Improvement Value $763,300 Tax Amount $9,583.03 Change Rate -0.102881% Assessed CR Tax Rate +0.004715%
Year 2019 Assessed Value $1,798,400 Land Value $1,079,700 Improvement Value $718,700 Tax Amount $10,682 Change Rate +0.034977% Assessed CR Tax Rate +0.00594%
Year 2018 Assessed Value $1,640,800 Land Value $974,600 Improvement Value $666,200 Tax Amount $10,321 Change Rate +0.019257% Assessed CR Tax Rate +0.00629%
Year 2017 Assessed Value $1,560,200 Land Value $929,000 Improvement Value $631,200 Tax Amount $10,126 Change Rate +0.162839% Assessed CR Tax Rate +0.00649%
Year 2016 Assessed Value $1,245,800 Land Value $774,700 Improvement Value $471,100 Tax Amount $8,708 Change Rate +0.027008% Assessed CR Tax Rate +0.00699%
Year 2015 Assessed Value $1,084,300 Land Value $666,100 Improvement Value $418,200 Tax Amount $8,479 Change Rate +0.024281% Assessed CR Tax Rate +0.00782%
Year 2014 Assessed Value $987,800 Land Value $613,500 Improvement Value $374,300 Tax Amount $8,278 Change Rate Assessed CR Tax Rate +0.00838%