14 Mamack Ln, Nantucket — property record card
Cooperative M01 built in 1992 on 0.13 acres in Nantucket, assessed at $4,648,400 for fiscal year 2026; last sold for $2,600,000 on September 5, 2025.
Rebuilt from the Nantucket assessor file as published by MassGIS — not the official card. For the official card, with owner, photo and sketch, ask the Nantucket assessor’s office.
Parcel
| Location | 14 Mamack Ln, Nantucket MA 02554 |
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| Map and parcel ID | 55 563 55_563_9 |
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| Use | Cooperative M01 (use code 1070) |
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| Zoning | R10 |
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| County | Nantucket |
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Valuation — fiscal year 2026
| Building | $2,795,500 |
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| Land | $1,816,000 |
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| Other | $36,900 |
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| Total assessed | $4,648,400 |
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Land
| Lot size | 0.13 acres (5,484 ft²) |
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Building
| Year built | 1992 |
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| Style | Cooperative |
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| Living area | 1,858 ft² |
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| Stories | 2 |
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| Units | 2 |
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Last recorded sale
| Price | $2,600,000 |
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| Date | September 5, 2025 |
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| Deed | Registry of Deeds book 2026, page 054 |
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2 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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| 14 Mamack Ln | 55_563_9 | Cooperative M01 | $2,326,900 | $2,600,000
September 5, 2025 |
| 24 Washaman Av | 55_563_8 | Cooperative M01 | $2,321,500 | $2,195,000
December 2, 2022 |
What MassDEP has recorded
No tier-classified 21E site and no Activity and Use Limitation is mapped on this parcel.
What this means
- Assessed 111% above the median cooperative m01 in Nantucket ($2,203,750, 100 parcels).
- The last sale price is 44% 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: Nantucket assessor file for fiscal year 2026, via MassGIS, retrieved October 30, 2026; MassDEP sites retrieved the same day. Sources and freshness. No owner names are published.
The report for 14 Mamack Ln
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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