9 Alton Ct 9-3, Brookline — property record card

Residential Condominium built in 1955 in Brookline, assessed at $16,284,700 for fiscal year 2027; last transferred April 24, 2026 for a nominal sum.

Rebuilt from the Brookline assessor file as published by MassGIS — not the official card. For the official card, with owner, photo and sketch, ask the Brookline assessor’s office.

Parcel

Location	9 Alton Ct 9-3, Brookline MA 02446
Map and parcel ID	155-40-00 155-40-15
Use	Residential Condominium (use code 102)
County	Norfolk

Valuation — fiscal year 2027

Building	$16,284,700
Land	$0
Total assessed	$16,284,700

Building

Year built	1955
Style	LOW RISE CONDO
Living area	599 ft²
Rooms	3
Stories	1

Last recorded sale

Price	nominal ($100)
Date	April 24, 2026
Deed	Registry of Deeds book 43065, page 28

30 assessor accounts on this parcel

Condominium units or several buildings share one parcel; each has its own assessment.

Address	Account	Use	Assessed	Last sale
5 Alton Ct 5-1 & P24	155-40-07	Residential Condominium	$516,400	$92,000 August 1, 1996
5 Alton Ct 5-2	155-40-08	Residential Condominium	$527,000	nominal ($1) June 18, 2012
5 Alton Ct 5-3	155-40-09	Residential Condominium	$529,300	$451,000 April 4, 2017
5 Alton Ct 5-4 & Pk Sp	155-40-10	Residential Condominium	$528,600	$229,000 July 14, 2000
5 Alton Ct 5-5	155-40-11	Residential Condominium	$515,600	$126,500 October 31, 1997
5 Alton Ct 5-6	155-40-12	Residential Condominium	$588,400	$465,000 March 31, 2016
9 Alton Ct 9-1 & P5	155-40-13	Residential Condominium	$585,700	$549,000 August 25, 2021
9 Alton Ct 9-2 & P23	155-40-14	Residential Condominium	$524,400	$560,000 January 4, 2022
9 Alton Ct 9-3	155-40-15	Residential Condominium	$618,400	$240,000 October 9, 2018
9 Alton Ct 9-4 & P22	155-40-16	Residential Condominium	$586,600	$610,000 June 12, 2024
9 Alton Ct 9-5 & P8	155-40-17	Residential Condominium	$514,000	$235,000 December 12, 2000
9 Alton Ct 9-6	155-40-18	Residential Condominium	$514,000	nominal ($100) December 13, 1991
15 Alton Ct 15-1	155-40-19	Residential Condominium	$527,000	$478,000 December 13, 2016
15 Alton Ct 15-2	155-40-20	Residential Condominium	$509,400	nominal ($100) July 31, 2013
15 Alton Ct 15-3 & P9	155-40-21	Residential Condominium	$523,600	nominal ($1) May 3, 2019
15 Alton Ct 15-4	155-40-22	Residential Condominium	$513,300	nominal ($1) December 7, 2005
15 Alton Ct 15-5	155-40-23	Residential Condominium	$512,500	$130,000 August 19, 1988
15 Alton Ct 15-6 & P3	155-40-24	Residential Condominium	$586,600	nominal ($1) April 8, 2024
19 Alton Ct 19-1 & P20	155-40-25	Residential Condominium	$523,200	$318,000 June 20, 2005
19 Alton Ct 19-2	155-40-26	Residential Condominium	$616,600	$85,000 December 23, 1996
19 Alton Ct 19-3	155-40-27	Residential Condominium	$513,300	nominal ($1) October 13, 2015
19 Alton Ct 19-4 & P12	155-40-28	Residential Condominium	$602,000	$555,800 September 29, 2020
19 Alton Ct 19-5	155-40-29	Residential Condominium	$510,200	nominal ($100) April 24, 2026
19 Alton Ct 19-6 & P15	155-40-30	Residential Condominium	$523,500	nominal ($100) December 22, 2016
31 Alton Pl 31-1 & P15	155-40-01	Residential Condominium	$531,400	$519,000 March 12, 2021
31 Alton Pl 31-2 & P27	155-40-02	Residential Condominium	$584,000	nominal ($1) March 10, 2026
31 Alton Pl 31-3	155-40-03	Residential Condominium	$515,600	$107,500 October 2, 1995
31 Alton Pl 31-4 & P28	155-40-04	Residential Condominium	$511,000	$270,000 November 4, 2002
31 Alton Pl 31-5	155-40-05	Residential Condominium	$616,600	$312,000 March 4, 2011
31 Alton Pl 31-6	155-40-06	Residential Condominium	$516,500	$590,000 July 18, 2025

What MassDEP has recorded

No tier-classified 21E site and no Activity and Use Limitation is mapped on this parcel.

Within about 500 m (a third of a mile): 0 active tier-classified 21E sites and 2 sites with an Activity and Use Limitation. All MassDEP sites in Brookline.

What this means

Assessed 339% above the median residential condominium in Brookline ($3,706,500, 1,424 parcels).
The last deed was recorded for a nominal sum: a transfer between family members, into a trust or a similar non-market sale. It says nothing about the market value.
Built before 1978: the Massachusetts Lead Law applies when a child under six lives there; ask for any lead inspection or letter of compliance.

Point at the centre of the assessor parcel — not a survey.

Data: Brookline assessor file for fiscal year 2027, via MassGIS, retrieved October 30, 2026; MassDEP sites retrieved the same day. Sources and freshness. No owner names are published.

First page of a sample Massachusetts Property Report

The report for 9 Alton Ct 9-3

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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