300 Commercial Street # 512, Boston MA 02109
Boston, MA 02109
$610,000
Est. $4,517/month
Estimate assumptions
20% down, a 30-year loan at 6.5%, and $200/month estimated insurance.
Includes the supplied property-tax and HOA inputs; missing inputs contribute $0. HOA fees with an unspecified frequency are treated as monthly. PMI and closing costs are excluded.
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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.
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Property History
Market Insights
11.5%
Price Range
2
Previous Sales
Property Timeline
Listed for Sale
Sep 17, 2026
$610,000
Original listing
Agent: Boston Real Estate Group
Office: Compass
Previous Transaction - MLS #72949573
Full transaction history available when tracking began
Previously Sold
Apr 14, 2022
$550,000
MLS #72949573
Previous Transaction - MLS #72074655
Full transaction history available when tracking began
Previously Sold
Nov 4, 2016
$540,000
MLS #72074655
| Date | Event | Price | Change | $/sqft | Details |
|---|---|---|---|---|---|
| 09/17/2026 | 🏠 Listed for Sale | $610,000 | - | - | Original listing |
| 04/14/2022 | 🏷️ Previously Sold | $550,000 | - | - | MLS #72949573 |
| 11/04/2016 | 🏷️ Previously Sold | $540,000 | - | - | MLS #72074655 |
Tax History
| Year | Taxes | Assessment |
|---|---|---|
| 2026 | $6,620 | $533,900 |
Financial Details
Annual Property Tax
$6,620
Tax Year 2026
HOA Fee
$680
Monthly
Assessed Value
$533,900
Facts & Features
Home Facts
Type
Residential
Style
Condominium
Year Built
1900
Living Area
577 sq ft
Stories
1
Bedrooms
1
Full Baths
1
Total Rooms
3
Interior
Heating
Heat Pump
Cooling
Heat Pump
Flooring
Parquet
Appliances
Range, Dishwasher, Disposal, Refrigerator, Washer, Dryer
Fireplace
None
Basement
N
Laundry
In Unit
Features
None
Exterior
Construction
Brick, Stone
Architecture
None
Roof
Rubber
Features
Patio - Enclosed
Pool
None
Spa
None
Fencing
None
Patio/Porch
Patio - Enclosed
Parking
Features
On Street
Utilities
Electric
None
Water
Public
Sewer
Public Sewer
Gas
None
Other
For Electric Range
Financial
Annual Tax
$6,620
Assessed Value
$533,900
HOA & Community
HOA Fee
$680 Monthly
Fee Includes
Water, Sewer, Insurance, Security, Snow Removal, Trash
Amenities
Elevator(s)
Optional Fee Includes
Water, Sewer, Master Insurance, Security, Elevator, Exterior Maintenance, Snow Removal, Refuse Removal
Pets
Yes w/ Restrictions
MA Disclosures
Lead Paint
Unknown
Seller Disclosures
None
Additional Details
Possession
None
Accepted Financing
None
Structure Type
["Mid-Rise"]
Unit/Building
512
Sq Ft Source
Public Record
Documents
Master Deed, Rules & Regs, Management Association Bylaws (3)
County
Suffolk
Property Overview
Property Type
Condominium
Listing Type
For Sale
Year Built
1900
Bedrooms
1
Full Bathrooms
1
Living Area
577 sq ft
Total Rooms
3
Stories
1
Entry Level
5
Floor Layout
Interactive room guide
Floor Layout
Finished Area
577 sq ft above grade
Display Options
Outdoor Areas
Patio & porchPatio - Enclosed
Room Markers
OOffice (1)
KKitchen (1)
BRBedroom (5)
BABathroom (4)
DDining (1)
LLiving (2)
Conceptual diagram based on MLS room data. It is not to scale and is not a substitute for architectural plans or on-site measurements.
Interior Features
Flooring:
Parquet
Appliances:
Range, Dishwasher, Disposal, Refrigerator, Washer, Dryer
Interior Features:
Windows:
Basement:
N
Laundry:
In Unit
Security:
Doorman, Concierge
Construction & Materials
Year Built:
1900
Effective Year (Renovated):
1986
Structure Type:
Mid-Rise
Exterior Materials:
Brick, Stone
Roof:
Rubber
Foundation:
Stories:
1
Heating, Cooling & Utilities
Heating:
Heat Pump
Heating Zones:
1
Cooling:
Heat Pump
Cooling Zones:
1
Hot Water:
Water Source:
Public
Sewer:
Public Sewer
Energy Features:
Exterior & Lot
Exterior Features:
Patio - Enclosed
Patio & Porch:
Patio - Enclosed
Fencing:
Other Structures:
Lot Features:
Road Surface:
Parking & Garage
Parking Features:
On Street
Special Features
Waterfront:
Yes
Waterfront Type:
Waterfront, Harbor
Community Amenities:
Public Transportation, Shopping, Pool, Park, Walk/Jog Trails, Medical Facility, Highway Access, Public School, T-Station, University
Nearby Schools
School information not available for this location.
Monthly Payment Calculator
Monthly Payment
$0
Principal, interest, taxes & insurance
Loan Amount
$0
After down payment
Total Interest
$0
Over life of loan
Total Cost
$0
Including down payment
%
Down: $0
%
Monthly Payment Breakdown
Principal & Interest
$0
Property Tax
$552
Homeowners Insurance
$200
HOA Fee
$680/mo
PMI (if <20% down)
$0
Loan Summary
Total of 360 payments
$0
Total principal paid
$0
Total interest paid
$0
Rate Impact
-0.5% Rate
$0/mo
Save $0/mo
Current Rate
$0/mo
+0.5% Rate
$0/mo
Cost $0/mo
Payment Over Time
Year 1
95% Interest
Year 15
50/50
Year 30
95% Principal
* Estimates only. Actual payments may vary. Consult with a lender for accurate figures.
Location
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Neighborhood
300 Commercial Street # 512, Boston MA 02109
Boston, MA 02109
Listing Information
Listing Agent
Boston Real Estate Group
Listing Office
Compass
Office Phone
617-206-3333
Agent MLS ID
TM338036
Office MLS ID
AN2383
Listing Data Updated
Sep 17, 2026 8:59 AM EDT
Listing information is deemed reliable but not guaranteed. Data provided by MLS Property Information Network, Inc. All information should be independently verified.
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