512 Marine St, Boulder, CO 80302 - Photo 1

1/1

$4,650,000

Sold
Closed
Single Family
4 Beds
4 Full Baths
1 Partial Bath
4,904 Sq. Ft.
2 Car Garage

1/1

Property Description

Located on one of Boulder's most iconic, tree-lined streets, this architecturally rich residence effortlessly blends timeless charm with elevated modern design. Thoughtfully curated and beautifully finished, the main level features sustainably refinished hardwood floors, soaring ceilings, and a striking gourmet kitchen outfitted with a new Sub-Zero refrigerator, Wolf range, and a marble-topped island ideal for gatherings. Refined living and dining spaces exude warmth and character with custom built-ins, designer lighting, and multiple fireplaces.Upstairs, the vaulted primary suite offers a true retreat, complete with its own fireplace, a private balcony, and sweeping Flatiron views. Two additional bedrooms are filled with light and comfort, each enjoying access to a beautifully appointed bath-one en suite, the other just a few steps away. A whimsical "secret" bonus room adds charm and flexibility for imaginative play or clever storage.The lower level expands the living experience with impressive ceiling height, a bright media room, custom shelving, glass-enclosed home office, and a private guest suite with a spa-like bath.Outdoors, the magic continues. The professionally landscaped backyard is a lush and tranquil sanctuary with a newly paved patio, serene waterfall feature, plumbed-in BBQ, and multiple entertaining spaces-plus a storybook two-story playhouse with sandbox and a full sprinkler system for year-round vibrancy. A detached cottage with vaulted ceilings, a kitchenette, and powder room offers flexible bonus space-perfect for a gym, office, studio, guest quarters or teen hangout-while the detached garage boasts epoxy floors and built-in storage. Just moments from top cafes, award-winning restaurants, boutique shopping, Chautauqua Park, and endless hiking trails, this is quintessential Boulder living at its finest.

Full Property Details

Full Property Details for 512 Marine St

General

Sold For: $4,650,000
Taxes: $25,584 (2024)
Status: Closed
Type: Single Family
Source: IRES
MLS ID: 1044486
Added to Site: 113 day(s) ago

Interior

Interior Features: Eat-In Kitchen, Separate Dining Room, Open Floorplan, Pantry, Wood Windows, Walk-In Closet(s), Washer/Dryer Hookup, Kitchen Island, High Ceilings
Fireplace: Yes
Fireplace(s): Two or More, Gas, Living Room, Family Room, Bedroom
Appliances: Gas Range, Double Oven, Refrigerator, Bar Fridge, Washer, Dryer, Microwave, Gas Bar-B-Q, Water Purifier Owned, Fire Alarm
Flooring: Wood

Rooms

Bathrooms

Total Bathrooms: 5
Full Bathrooms: 4
Half Bathrooms: 1
Basement Baths: 1

Bedrooms

Total Bedrooms: 4

Exterior

Exterior Features: Sprinkler System, Balcony
Porch/Patio/Deck: Patio

Parking

Garage: Yes
Garage Spaces: 2
Garage Description: Detached

Location

Area: Boulder
County: Boulder
Subdivision: Highland Lawn

School Information

School District: Boulder Valley Dist RE2
Elementary School: Flatirons
Middle School: Manhattan
High School: Boulder

Heating & Cooling

Cooling Type: Central Air
Heating Type: Forced Air

Utilities

Gas: Yes
Gas: Xcel Energy
Sewer: Public Sewer
Water: City
Utility Description: Natural Gas Available, Electricity Available, Cable Available

Structural Information

Architectural Style: Victorian
Construction: Frame, Brick
Exterior Const.: Frame, Brick
Basement: Yes
Basement Desc.: Full, Partially Finished, Built-In Radon, Sump Pump
Roof: Composition
Windows: Window Coverings
Square Feet: 4,904
Sq. Ft. Source: Assessor
Living Area: 4,465 Sq. Ft.
Year Built: 1903

Lot Features

Property View: Hills
Lot Size (Acres): 0.23
Lot Size (Sq. Ft.): 9,947
Frontage: City Street
Street/Road Desc.: Asphalt
Fence: Yes
Lot Features: Wooded, Deciduous Trees, Level, Paved, Curbs, Gutters, Sidewalks
Zoning: RES
Fencing (Description): Fenced

Financial Considerations

Tax Amount: $25,584
Tax Year: 2024
Terms: Cash, Conventional

Disclosures and Reports

Special Conditions: Private Owner
Exclusions: Seller's personal property and speaker system located in basement.
Property ID: R0000453

Listed by RE/MAX of Boulder, Inc (303) 449-7000
Sold by RE/MAX of Boulder, Inc (303) 817-1282

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Listing agent

— 512 Marine St —

RE/MAX of Boulder, Inc

303-449-7000

3038171282

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Schools

Schools serving 512 Marine St

School District:Boulder Valley School District Re-2

Name	Grades	Distance
Flatirons Elementary School 1150 7th Street, Boulder, CO 80302	K-5	0.3 mi
Manhattan Middle School Of The Arts And Academics 290 Manhattan Drive, Boulder, CO 80303	6-8	3.4 mi
Boulder High School 1604 Arapahoe Avenue, Boulder, CO 80302	9-12	0.9 mi

Disclaimer: School attendance boundaries provided by Pitney Bowes and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 512 Marine St

Date

Details

Price

Change

Source

11/21/2025

Sold

$4,650,000

-2.11%

MLS

9/25/2025

Listed

$4,750,000

—

MLS

Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

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512 Marine St, Boulder, CO 80302 (MLS# 1044486) is a Single Family property that was sold at $4,650,000 on November 21, 2025. Want to learn more about 512 Marine St? Do you have questions about finding other Single Family real estate for sale in Boulder? You can browse all Boulder real estate or contact a Coldwell Banker agent to request more information.

512 Marine St Boulder, CO 80302