Condominium at 300 Commercial Street # 512, Boston MA 02109, Boston
Condominium at 300 Commercial Street # 512, Boston MA 02109, Boston, photo 2 of 17
Condominium at 300 Commercial Street # 512, Boston MA 02109, Boston, photo 3 of 17
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17 photos

$610,000

300 Commercial Street # 512, Boston MA 02109
Boston, MA 02109
Listed by Boston Real Estate Group
Bedrooms
1
Bathrooms
1
Living area
577 sqft
Year built
1900

About this home

Welcome home to Boston's waterfront at The Mariner, where the comforts of a full-service elevator building meet harbor living. This inviting one-bedroom residence features an open-concept main living area with high ceilings that flows out to a private, covered balcony, the perfect spot for morning coffee or hosting with a view of the city skyline. Other defining features include central air conditioning, in-unit laundry, and recessed lighting. Residents of The Mariner enjoy 24-hour concierge service, plus access to an oversized, furnished common roof deck with sweeping panoramic views of Boston Harbor. Originally built in 1911 and converted to condos in 1987, the building itself carries the character of Boston's storied waterfront. Recent noteworthy capital improvements within the association include a new cooling tower and boiler, roof, exterior façade coating, and an updated lobby and hallways. Improvements within the unit include a new HVAC system (2023), refrigerator (2023), and dishwasher (2023), washer and dryer (2022). Ideally located just steps from the Historic North End harborwalk, Hanover Street restaurants, the Financial District, and TD Garden. Pets are permitted with trustee approval.

Highlights

Waterfront

Property details

MLS #
73578792
Property type
Condominium
Subdivision
N/A
Status
Active
Days on market
25
On market date
September 17, 2026
Stories
1
Total bathrooms
1
Garage spaces
N/A
Parking spaces
N/A
Lot size
N/A
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Nearby schools

Within 10 miles. School directory data from the National Center for Education Statistics (NCES), accessed via the Urban Institute Education Data API. Local Score is calculated by INNOVATE Real Estate; where a state rating is shown, it comes from that state's own official school report card.

Elementary
Eliot Elementary
0.12 mi away · Grades -1-8
Nearest school -- attendance-zone data not available here
4.0
Local Score (student-teacher ratio only (preliminary -- will incorporate state test-score data once available)) -- not an official state rating
Enrollment
796
Student:teacher ratio
14.5:1
District
Boston
Middle
Cambridge Street Upper School
2.09 mi away · Grades 6-8
Nearest school -- attendance-zone data not available here
5.0
Local Score (student-teacher ratio only (preliminary -- will incorporate state test-score data once available)) -- not an official state rating
Enrollment
279
Student:teacher ratio
7.5:1
District
Cambridge
High
Charlestown High
1.15 mi away · Grades 7-12
Nearest school -- attendance-zone data not available here
5.0
Local Score (student-teacher ratio only (preliminary -- will incorporate state test-score data once available)) -- not an official state rating
Enrollment
821
Student:teacher ratio
9.8:1
District
Boston

Walkability

Blended score for Boston's center, calculated by INNOVATE Real Estate from two sources: the EPA's National Walkability Index (street network, transit, land-use mix) and Google Places amenity data (what's actually reachable on foot from this point). 60% EPA National Walkability Index + 40% nearby-amenity density (Google Places).

88
Highly walkable
out of 100
EPA National Walkability Index
15.8 / 20 -- Most walkable
Google Places amenity density
100 / 100
Restaurants & cafes20
Grocery stores20
Parks20
Schools20
Transit stops20
Pharmacies20

Market position

How this listing compares to current activity in Boston, from live MLS data.

On the market 25 days -- 95 fewer days than Boston's current average of 120 days.
For reference, the median list price across 8,628 active listings in Boston right now is $49,000.

Mortgage calculator

Estimate only - actual rate and payment depend on your lender, credit, and loan program.

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Est. monthly payment
$3,823/mo
$122,000 down
$488,000 loan
Principal & interest$3,165
Property tax (est.)$508
Home insurance (est.)$150

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Data source: Listing information provided by MLS Property Information Network via Trestle/CoreLogic. Last updated 22 days ago.

Information herein deemed reliable but not guaranteed; all measurements, school assignments, HOA fees, taxes, and feature lists are approximate and should be independently verified. Equal Housing Opportunity.