5 Onamog St #5C, Marlborough — property record card
Residential Condominium built in 1990 in Marlborough, assessed at $3,243,600 for fiscal year 2025; last sold for $430,000 on August 30, 2024.
Rebuilt from the Marlborough assessor file as published by MassGIS — not the official card. For the official card, with owner, photo and sketch, ask the Marlborough assessor’s office.
Parcel
| Location | 5 Onamog St #5C, Marlborough MA 01752 |
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| Map and parcel ID | 81-257 81_257_3_5C |
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| Use | Residential Condominium (use code 1020) |
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| County | Middlesex |
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Valuation — fiscal year 2025
| Building | $3,222,400 |
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| Land | $0 |
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| Other | $21,200 |
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| Total assessed | $3,243,600 |
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Building
| Year built | 1990 |
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| Style | Condominium |
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| Living area | 1,296 ft² |
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| Units | 10 |
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Last recorded sale
| Price | $430,000 |
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| Date | August 30, 2024 |
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| Deed | Registry of Deeds book 83194, page 0579 |
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10 assessor accounts on this parcel
Condominium units or several buildings share one parcel; each has its own assessment.
| Address | Account | Use | Assessed | Last sale |
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| 5 Onamog St #5A | 81_257_3_5A | Residential Condominium | $366,100 | nominal ($100)
December 24, 2021 |
| 5 Onamog St #5B | 81_257_3_5B | Residential Condominium | $365,500 | $270,000
August 16, 2017 |
| 5 Onamog St #5C | 81_257_3_5C | Residential Condominium | $369,600 | $286,000
December 27, 2017 |
| 5-19 Onamog St | 81_257_1_45 | Other, Open Space | $0 | |
| 15 Onamog St #15A | 81_257_2_15A | Residential Condominium | $358,800 | $430,000
August 30, 2024 |
| 15 Onamog St #15B | 81_257_2_15B | Residential Condominium | $361,300 | $277,000
October 19, 2018 |
| 15 Onamog St #15C | 81_257_2_15C | Residential Condominium | $361,100 | $126,900
June 30, 1998 |
| 19 Onamog St #19A | 81_257_1_19A | Residential Condominium | $367,700 | nominal ($1)
December 13, 2022 |
| 19 Onamog St #19B | 81_257_1_19B | Residential Condominium | $340,600 | $175,000
October 15, 2014 |
| 19 Onamog St #19C | 81_257_1_19C | Residential Condominium | $352,900 | $235,000
January 12, 2018 |
What MassDEP has recorded
No tier-classified 21E site and no Activity and Use Limitation is mapped on this parcel.
What this means
- Assessed 138% above the median residential condominium in Marlborough ($1,361,350, 128 parcels).
- The last sale price is 87% below the current assessment. Massachusetts assessments aim at full market value as of January 1 of the year before the fiscal year.
Point at the centre of the assessor parcel — not a survey.
Data: Marlborough assessor file for fiscal year 2025, via MassGIS, retrieved October 30, 2026; MassDEP sites retrieved the same day. Sources and freshness. No owner names are published.
The report for 5 Onamog St #5C
This page shows the assessor record and the MassDEP sites on the parcel. The report adds what lies around it: FEMA flood zone, wetlands, Zone II and other water supply protection areas, priority habitat, sewer or septic service, protected open space, and every 21E site within half a mile.
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