Google satellite image for 521 Main St Unit B, Groton, MA 01450

Off market

$420,629

•

2 ba

•

1,032

sq ft

521 Main St Unit B, Groton, MA 01450

About this home

521 Main St Unit B is a 1,032 square foot condo with 2 bedrooms and 2 bathrooms. Based on Redfin's Groton data, we estimate the home's value is $420,629.

CondoProperty Type

2006Year Built

$408Est. Price/Sq.Ft.

Source:Public Records

Redfin Estimate

$420,629

$4,000 since October

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 3.9% lower than the average sale price ($438K) of 6 comparable homes.

SOLD OCT 14, 2026
$590,000
A
2 beds2 baths1,305 sq ft
307 Autumn Ridge Dr #307, Ayer, MA 01432
SOLD MAY 6, 2026
$425,000
B
2 beds2 baths1,092 sq ft
519 Main St Unit D, Groton, MA 01450
SOLD JAN 30, 2026
$199,700
C
2 beds2 baths1,092 sq ft
521 Main St Unit D, Groton, MA 01450
SOLD JUL 31, 2026
$590,000
D
2 beds2 baths1,318 sq ft
606 Autumn Ridge Dr #606, Ayer, MA 01432
SOLD OCT 2, 2026
$402,000
E
2 beds1.5 baths1,080 sq ft
55 Littleton Rd Unit 11B, Ayer, MA 01432
SOLD AUG 24, 2026
$420,000
F
2 beds1.5 baths1,404 sq ft
26 Bradley Dr Unit C, Groton, MA 01450

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Earn from this home

Sell

$398,783

Est. take-home

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Rent

$2,303/mo

Redfin rental estimate

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Market trends in 01450, MA

Last updated October 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-list price

100.5%

+0.4% MoM

Median sale price

$851K

$24K MoM

Avg. days on market

27d

0 days MoM

Recently sold homes

11 MoM

New listings for sale

OPEN TODAY, 1:30PM TO 3PM
$505,000
3 beds1 bath1,112 sq ft
26 Forge Village Rd, Groton, MA 01450
OPEN TODAY, 10:30AM TO 12:30PM
$450,000
2 beds1 bath1,188 sq ft
177 Hollis St, Groton, MA 01450
OPEN TODAY, 11AM TO 1PM
$489,900
3 beds2 baths1,736 sq ft
9 Valley Rd, Groton, MA 01450
See all

Provided by Redfin

Sale history for 521 Main St Unit B

As the MLS and public records start to fill up, we'll list the details here.

Tax history for 521 Main St Unit B

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Property details

Interior

Bathroom Information
# of Full Baths: 2

Heating & Cooling
Heating Type: Forced Air

Room Information
# of Rooms: 5

Exterior

Exterior Information
Physical Condition: Average
Exterior Wall: Vinyl
Roof Shape Type: Gable

Property Information
Subdivision Name: GROTON RESIDENTIAL GARDENS CONDO
Living Sq. Ft: 1,032
Gross Sq. Ft: 1,104
Ground Floor Sq. Ft: 1,032
# of Units: 1
# of Stories: 1

Lot Information
# of Buildings: 1
Land Sq. Ft: 231,516
Municipality Name: GROTON
Acres: 5.3149
Zoning Code: RA
State Use Description: CONDOMINIUM

Financial

Assessor Information
Assessment Year: 2026

Public facts

Beds: 2
Baths: 2.0
Sq. Ft.: 1,032
Stories: 1.0
Lot Size: —
Style: Condo/Co-op
Year Built: 2006
Year Renovated: —
County: Middlesex County
APN: 516911S

Home facts updated by county records on Sep 10, 2026

Around this home

Schools

K - 12
Preschool & daycare

Groton Dunstable Regional Middle School

Public 5-8 • Assigned • 0.6mi

7/10

Groton-Dunstable Regional High School

Public 9-12 • Assigned • 3.1mi

9/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

4/10 Fire Factor

1% chance of being in a wildfire in next 30 years

4/10 Heat Factor

7 days above 96° expected this year, 16 days in 30 years

6/10 Wind Factor

27% chance of strong winds in next 30 years

2/10 Air Factor

1 unhealthy days expected this year, 1 days in 30 years

Provided by First Street

Historical weather

Groton, MA • 01450

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

Try the sun simulator tool to see how light moves across the property at different times of day and year.

Provided by Shadowmap

Estimated sale price

$400,000 – $484,000

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Nearby similar homes

OPEN TODAY, 1PM TO 3PM3D WALKTHROUGH

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New listings for sale in 01450

OPEN TODAY, 1:30PM TO 3PM

$505,000

3 beds1 bath1,112 sq ft

26 Forge Village Rd, Groton, MA 01450

Level corner lot • Mature trees • Honey oak cabinetry

OPEN TODAY, 10:30AM TO 12:30PM

$450,000

2 beds1 bath1,188 sq ft

177 Hollis St, Groton, MA 01450

Circular driveway • Enclosed porch • Pantry closet

OPEN TODAY, 11AM TO 1PM

$489,900

3 beds2 baths1,736 sq ft

9 Valley Rd, Groton, MA 01450

Lower level living • Bonus family room • Walk in closet

Home values near 521 Main St Unit B

Data from public records.

Address	Redfin Estimate
515 Main Street Unit B, Groton, MA 2 Beds \| 2 Baths \| 1044 Sq. Ft.	$308,401
521 Main Street Unit A, Groton, MA 2 Beds \| 2 Baths \| 1218 Sq. Ft.	$409,977
519 Main Street Unit B, Groton, MA 2 Beds \| 2 Baths \| 1118 Sq. Ft.	$267,447
517 Main Street Unit B, Groton, MA 3 Beds \| 2 Baths \| 1412 Sq. Ft.	$451,536
515 Main Street Unit A, Groton, MA 3 Beds \| 2 Baths \| 1446 Sq. Ft.	$460,087
519 Main Street Unit B, Groton, MA 2 Beds \| 2 Baths \| 1032 Sq. Ft.	$285,371
517 Main Street Unit C, Groton, MA 2 Beds \| 2 Baths \| 1092 Sq. Ft.	$422,281

Address	Redfin Estimate
517 Main Street Unit A, Groton, MA 2 Beds \| 2 Baths \| 1118 Sq. Ft.	$275,760
521 Main Street Unit C, Groton, MA 2 Beds \| 2 Baths \| 1092 Sq. Ft.	$371,445
519 Main Street Unit C, Groton, MA 2 Beds \| 2 Baths \| 1202 Sq. Ft.	$394,653
517 Main Street Unit C, Groton, MA 2 Beds \| 2 Baths \| 1164 Sq. Ft.	$417,462
515 Main Street Unit C, Groton, MA 2 Beds \| 2 Baths \| 1092 Sq. Ft.	$415,733
519 Main Street Unit D, Groton, MA 2 Beds \| 2 Baths \| 1092 Sq. Ft.	$438,757
519 Main Street Unit C, Groton, MA 2 Beds \| 2 Baths \| 1202 Sq. Ft.	$401,314

Address	Redfin Estimate
519 Main Street Unit A, Groton, MA 3 Beds \| 2 Baths \| 1425 Sq. Ft.	$442,624
521 Main Street Unit D, Groton, MA 2 Beds \| 2 Baths \| 1092 Sq. Ft.	$345,632
519 Main Street Unit D, Groton, MA 2 Beds \| 2 Baths \| 1092 Sq. Ft.	$367,259
517 Main Street Unit D, Groton, MA 2 Beds \| 2 Baths \| 1097 Sq. Ft.	$359,729
515 Main Street Unit D, Groton, MA 2 Beds \| 2 Baths \| 1092 Sq. Ft.	$258,914
517 Main Street Unit B, Groton, MA 3 Beds \| 2 Baths \| 1412 Sq. Ft.	$492,620
517 Main Street Unit A, Groton, MA 2 Beds \| 2 Baths \| 1032 Sq. Ft.	$266,430

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