401 Sandy Valley Rd Westwood — Photo 1 of 26
Recent Drop: $890,000
$8,800,000
Investment Analysis — 401 Sandy Valley Rd
Westwood, MA 02090
Based on HUD Small Area Fair Market Rent for Boston-Cambridge-Quincy, MA-NH HUD Metro FMR Area, a 7-bedroom in 02090 carries an estimated $4,250/mo in gross rent — about a -0.59% cap rate and $-52,328/yr in estimated NOI at the $8,800,000 list price. Adjust every assumption in the calculator below.
Beds
7
Baths
6.5
SqFt
12,762
Style
Single Family
Built
1936
Set at the end of a long winding drive, this remarkable 16+ acre estate abuts more than 100 acres of conservation land, creating a rare sense of privacy and natural beauty. Suited for formal entertaining, intimate gatherings, and gracious family living, it includes a welcoming main entrance hall, a wonderful living room with an attached library, a spacious formal dining room with adjoining butler’s pantry, and a stunning chef’s kitchen that overlooks a fireplaced family room and a covered patio. There are 7 bedrooms highlighted by a stunning primary suite, as well as two offices, a playroom, an exercise room, and an attached, heated three-car garage. Outdoor amenities include a heated pool with a well-appointed pool house, a sport court, a stream-fed pond, and a barn-garage with a greenhouse and two horse stalls, along with a charming two-bedroom cottage. This exceptional property offers access to excellent public and private schools, Legacy Place, the train, and Boston via Rte. 95/128
ADU Potential
Massachusetts allows one accessory dwelling unit by right in single-family zoning districts statewide (M.G.L. c. 40A §3; 760 CMR 71.00, effective Feb 2025). Estimated maximum ADU size for this property: 900 sq ft (the lesser of 900 sq ft or half the 12,762 sq ft principal dwelling). Lot size: 730,936 sq ft.
Based on listing data, which indicates the property type — not the zoning district. Local dimensional, septic (Title 5), and historic-district requirements still apply. Not legal advice — verify with the municipality.
Estimates — not financial advice
These figures are illustrative estimates for informational purposes only — not an appraisal, valuation, or guarantee of rent, income, or returns, and not financial, tax, or investment advice. Rent is either the figure reported on the MLS listing — in-place rent that may differ from market and is not verified against the actual leases — or, where the listing reports none, an estimate from HUD Small Area Fair Market Rents, a government benchmark that may differ from actual market rent. Each figure is labelled with its source. Cap rate, NOI, and returns depend on the assumptions shown, which you can change. MLS and other third-party data may be inaccurate or out of date. Verify all figures independently and consult your own financial, tax, and legal advisors before making any investment decision.
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Property History
$30,000
Aug 15, 2026
MLS® 73564111
$8,800,000
Was $9,000,000
May 7, 2026
MLS® 73457104
$9,000,000
Was $9,300,000
Mar 13, 2026
MLS® 73457104
$9,300,000
Was $9,690,000
Feb 13, 2026
MLS® 73457104
$9,690,000
Nov 21, 2025
MLS® 73457104
$10,900,000
Nov 18, 2025
MLS® 73330261
$12,950,000
Mar 19, 2025
MLS® 73250023
$10,900,000
Jan 29, 2025
MLS® 73330261
$12,950,000
Jun 10, 2024
MLS® 73250023
Listing Agent: John Boyle
Listing Office: LandVest, Inc.
MLS® Number: 73457104