For sale

$3,495,000

21 Branch St, Boston, MA 02108

2beds

1,832sqft

$22,840/mo

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Single Family Residence

Built in 1899

797 Square Feet Lot

$3,311,000 Zestimate^®

$1,908/sqft

$-- HOA

What's special

Positioned on Beacon Hill's desirable South Slope, 21 Branch Street is a tastefully renovated single family carriage house featuring a rare private garage. With storybook views & beaming sunlight, this elegant home offers a charming private deck, 2 bedrooms plus an oversized den/ family room (or guest bdrm) & 2 bathrooms. The gracious entry foyer w/ marble floor sets the stage for this exceptional offering. The lovely formal living, dining & open concept kitchen offers an excellent layout & sun beams into the picturesque spaces where multiple exposures show surrounding architecture & gardens. The well-appointed kitchen features granite, notable appliances, eye catching light fixtures/hardware, and an inviting island. This floor is complemented by 2 fireplaces and 8 windows. The primary suite is the entire top floor w/ more incredible sunlight, a luxurious closet and bath & a front facing deck. Fabulous suite-like 2nd bed & bath w/fireplace offer complete privacy. Truly exceptional!

93 days

1,597

73

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms: 2
Bathrooms: 2
Full bathrooms: 2

Primary bedroom

Level: Third
Area: 208
Dimensions: 13 x 16

Bedroom 2

Level: First
Area: 210
Dimensions: 15 x 14

Primary bathroom

Features: Yes

Dining room

Level: Second
Area: 126
Dimensions: 14 x 9

Family room

Level: Second
Area: 216
Dimensions: 18 x 12

Kitchen

Level: Second
Area: 126
Dimensions: 9 x 14

Living room

Level: Second
Area: 156
Dimensions: 12 x 13

Heating

Forced Air, Electric Baseboard

Cooling

Central Air, Ductless

Appliances

Included: Range, Dishwasher, Disposal, Refrigerator, Freezer, Washer, Dryer

Features

Flooring: Wood
Has basement: No
Number of fireplaces: 3

Interior area

Total structure area: 1,832
Total interior livable area: 1,832 sqft
Finished area above ground: 1,832

Property

Parking

Total spaces: 1
Parking features: Attached
Attached garage spaces: 1

Features

Patio & porch: Deck - Roof
Exterior features: Balcony / Deck, Deck - Roof

Lot

Size: 797 Square Feet
Features: Gentle Sloping, Other

Details

Parcel number: 3356343
Zoning: Res

Construction

Type & style

Home type: SingleFamily
Architectural style: Carriage House,Other (See Remarks)
Property subtype: Single Family Residence
Attached to another structure: Yes

Materials

Brick, See Remarks
Foundation: Other
Roof: Rubber,Other

Condition

Year built: 1899

Utilities & green energy

Sewer: Public Sewer
Water: Public
Utilities for property: for Gas Range

Community & HOA

Community

Features: Public Transportation, Tennis Court(s), Park, Walk/Jog Trails, Medical Facility, Bike Path, Highway Access, T-Station, Other

HOA

Has HOA: No

Location

Region: Boston

Financial & listing details

Price per square foot: $1,908/sqft
Tax assessed value: $3,034,000
Annual tax amount: $37,985
Date on market: 5/12/2026

Estimated market value

$3,311,000

$3.15M - $3.48M

$4,842/mo

Price history

Date	Event	Price
5/12/2026	Listed for sale	$3,495,000+16.5%$1,908/sqft
Source: MLS PIN #73514647 Report a problem
10/6/2025	Sold	$3,000,000-3.2%$1,638/sqft
Source: MLS PIN #73395764 Report a problem
9/13/2025	Contingent	$3,100,000$1,692/sqft
Source: MLS PIN #73395764 Report a problem
9/8/2025	Price change	$3,100,000-5.9%$1,692/sqft
Source: MLS PIN #73395764 Report a problem
6/24/2025	Listed for sale	$3,295,000+3%$1,799/sqft
Source: MLS PIN #73395764 Report a problem
10/13/2023	Sold	$3,200,000-1.5%$1,747/sqft
Source: MLS PIN #73151085 Report a problem
8/22/2023	Price change	$3,249,000+8.5%$1,773/sqft
Source: MLS PIN #73151085 Report a problem
5/30/2023	Listed for sale	$2,995,000$1,635/sqft
Source: MLS PIN #73113834 Report a problem
5/23/2023	Contingent	$2,995,000$1,635/sqft
Source: MLS PIN #73113834 Report a problem
5/18/2023	Listed for sale	$2,995,000+25.1%$1,635/sqft
Source: MLS PIN #73113834 Report a problem
6/26/2019	Sold	$2,395,000+4.4%$1,307/sqft
Source: Public Record Report a problem
4/10/2019	Listed for sale	$2,295,000+59.1%$1,253/sqft
Source: Compass #72479955 Report a problem
12/29/2010	Sold	$1,442,500$787/sqft
Source: Public Record Report a problem

Public tax history

Year	Property taxes	Tax assessment
2025	$34,117 +26.1%	$2,946,200 +18.7%
2024	$27,046 +1.5%	$2,481,300
2023	$26,649 +5.8%	$2,481,300 +7.2%
2022	$25,194 +4%	$2,315,600 +2%
2021	$24,223 +19.8%	$2,270,200 +18.6%
2020	$20,214 +4.4%	$1,914,200 +4.2%
2019	$19,371 +7.6%	$1,837,900 +7%
2018	$18,008 +369.3%	$1,718,300 +5%
2017	$3,837 -77.8%	$1,636,500 +4%
2016	$17,310 -14.7%	$1,573,600 -6.1%
2015	$20,288 +1.1%	$1,675,300 +5%
2014	$20,071 +3.4%	$1,595,500 +8%
2013	$19,412 -0.8%	$1,477,300 -1.6%
2012	$19,570 +31.9%	$1,500,800 +29.3%
2011	$14,840 +22.5%	$1,160,300 +13.8%
2010	$12,114 +12.8%	$1,019,700 +0.9%
2009	$10,743 -3%	$1,010,600 +0.1%
2008	$11,072 -5.8%	$1,009,300 -5.7%
2007	$11,757 +0.5%	$1,069,800 +1.7%
2006	$11,696 +7.1%	$1,051,800 +3.3%
2005	$10,924 -5.9%	$1,018,100 -11%
2004	$11,612 -9.9%	$1,144,000 +0.2%
2003	$12,892 +27.4%	$1,141,900 +24.2%
2002	$10,121 +25.4%	$919,300 +49.8%
2000	$8,071	$613,800