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 District
Boston School District local
C-
Where Graduates Go
Class of 2021
52%
attend college
38%
4-Year
14%
2-Year
7%
Out of State
7%
Working
School Safety
2024-25
3.7%
Above Average
3.2%
Suspensions
0.3%
In-School
0.5%
Emergency
1.8% below state avg
Elementary Schools
10 schools
St. John Elementary School
0.1 mi
Grades PK-08
A
Eliot K-8 Innovation School
0.1 mi
|
#47 of 352
|
Score: 57.5
Improved 3 spots from last year
-0.7 below state avg
779 students
Diverse
Strong Attendance
Grades PK-08
East Boston Central Catholic School
0.8 mi
Grades PK-08
B+
Alighieri Dante Montessori School
0.8 mi
|
#5 of 12
|
Score: 45.2
Improved 124 spots from last year
-13 below state avg
100 students
Diverse
Rising School
Strong Attendance
Grades PK-06
D
Adams Elementary School
0.9 mi
|
#770 of 825
|
Score: 31.0
Dropped 91 spots from last year
-27.2 below state avg
222 students
Moderate
Grades PK-06
C
Harvard-Kent Elementary School
0.9 mi
|
#593 of 825
|
Score: 41.1
Dropped 185 spots from last year
-17.1 below state avg
315 students
Very Diverse
Diverse Student Body
Grades PK-06
D
McKay K-8 School
0.9 mi
|
#332 of 352
|
Score: 27.4
Dropped 36 spots from last year
-30.8 below state avg
599 students
Less Diverse
Grades PK-08
C+
Mario Umana Academy
1.0 mi
|
#11 of 16
|
Score: 26.5
Improved 333 spots from last year
-31.7 below state avg
585 students
Less Diverse
Rising School
Grades PK-08
C-
Kennedy Patrick J Elementary School
1.1 mi
|
#669 of 825
|
Score: 37.4
Improved 48 spots from last year
-20.8 below state avg
285 students
Less Diverse
Rising School
Grades PK-06
A-
Warren-Prescott K-8 School
1.1 mi
|
#86 of 352
|
Score: 50.9
Improved 3 spots from last year
-7.3 below state avg
544 students
Diverse
Strong Attendance
Grades PK-08
Middle Schools
10 schools
Middle School Academy
2.2 mi
F
Higginson/Lewis K-8 School
3.5 mi
|
#349 of 352
|
Score: 23.2
Improved 3 spots from last year
-35 below state avg
246 students
Diverse
Grades 03-08
A
Uncommon Schools - Roxbury Preparatory Dorchester Campus Middle School
3.9 mi
|
#4 of 16
|
Score: 42.5
Improved 187 spots from last year
-15.7 below state avg
1,225 students
Diverse
Rising School
College Ready Curriculum
Grades 05-08
Nativity Prep School
4.0 mi
Grades 05-08
Dearborn Middle School
4.3 mi
Mother Caroline Academy
4.3 mi
Grades 05-08
Epiphany School
5.0 mi
Grades 05-08
C
Ohrenberger School
8.7 mi
|
#266 of 352
|
Score: 35.0
Improved 19 spots from last year
-23.2 below state avg
458 students
Diverse
Diverse Student Body
Grades 03-08
Edwards Middle
1.3 mi
UP Academy
2.2 mi
High Schools
10 schools
D
Charlestown High School
1.2 mi
|
#319 of 346
|
Score: 32.9
Improved 52 spots from last year
-25.4 below state avg
646 students
Diverse
11 sports
• 488 athletes
Early College Program
Rising School
Grades 07-12
C
Quincy Upper School
1.4 mi
|
#279 of 346
|
Score: 44.4
Dropped 7 spots from last year
-13.8 below state avg
575 students
Very Diverse
12 sports
• 208 athletes
Diverse Student Body
Grades 06-12
C-
East Boston High School
1.4 mi
|
#300 of 346
|
Score: 38.2
Improved 36 spots from last year
-20 below state avg
1,181 students
Moderate
14 sports
• 584 athletes
Early College Program
Rising School
Grades 07-12
Newman School
1.8 mi
Grades 07-12
Cathedral High School
1.9 mi
9 sports
• 430 athletes
Grades 07-12
A-
O'Bryant School of Math & Science
3.1 mi
|
#90 of 346
|
Score: 61.6
Improved 94 spots from last year
+3.4 above state avg
1,518 students
Very Diverse
High Graduation Rate
Rising School
College Ready Curriculum
Diverse Student Body
Grades 07-12
B
Dearborn STEM Academy
3.1 mi
|
#13 of 25
|
Score: 33.4
Improved 356 spots from last year
-24.8 below state avg
565 students
Moderate
10 sports
• 242 athletes
Early College Program
Rising School
Grades 07-12
A+
Boston Latin School
3.2 mi
|
#20 of 346
|
Score: 73.7
Improved 60 spots from last year
+15.5 above state avg
2,382 students
Very Diverse
18 sports
• 2,006 athletes
Strong AP Program
High Graduation Rate
Rising School
Strong Athletics
Grades 07-12
C
Ruth Batson Academy
3.3 mi
|
#20 of 25
|
Score: 29.1
Improved 345 spots from last year
-29.1 below state avg
584 students
Diverse
8 sports
• 128 athletes
Early College Program
Rising School
Grades 07-12
A+
Boston Latin Academy
3.8 mi
|
#2 of 25
|
Score: 64.9
Improved 214 spots from last year
+6.7 above state avg
1,669 students
Very Diverse
17 sports
• 1,298 athletes
Strong AP Program
High Graduation Rate
Rising School
Strong Athletics
Grades 07-12
Learn about these ratings
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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