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512 Marine St

Boulder, CO 80302

4 beds
5 baths
4,465 sqft
9,947 sqft lot
$1,116 per sqft
1903 build
– on site

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.

Listing courtesy of IRES

Last checked: Checking… • Last updated Jun 24, 2025 •

MLS# 1036876 —

This home is listed in more than one place. See it here.

The Building

Year Built:

1903
New Construction:

false
Construction Materials:

Wood/Frame
Architectural Style:

Victorian
Total SqFt:

4,904 Sqft
Building Area Total:

3238
Roof:

Composition
Levels:

Two
Basement:

Full
Stories:

2
Window Features:

Window Coverings
Patio And Porch Features:

Patio
Above Grade Finished Area:

3238
Below Grade Finished Area:

1412

Interior

Interior Features:

Study Area
Flooring:

Wood Floors
Fireplace:

true
Fireplace Features:

2+ Fireplaces
Living Room Level:

Main
Living Room Features:

Hardwood
Kitchen Level:

Main
Kitchen Features:

Hardwood
Dining Room Level:

Main
Dining Room Features:

Hardwood
Family Room Level:

Main
Family Room Features:

Hardwood
Laundry Features:

Washer/Dryer Hookups

Room Dimensions

Living Area:

4465
Study Length:

9
Living Area Units:

Square Feet
Living Area Source:

Other
Main Floor SqFt:

3245
Living Room Area:

253
Living Room Length:

23
Living Room Width:

11
Kitchen Length:

10
Kitchen Area:

250
Kitchen Width:

25
Dining Room Area:

182
Dining Room Length:

13
Dining Room Width:

14
Family Room Area:

350
Family Room Length:

14
Family Room Width:

25
Master Bedroom Area:

405
Master Bedroom Width:

27
Master Bedroom Length:

15
Bedroom 2 Area:

156
Bedroom 2 Length:

12
Bedroom 3 Length:

13
Bedroom 2 Width:

13
Bedroom 4 Length:

16
Bedroom 3 Area:

169
Bedroom 3 Width:

13
Bedroom 4 Area:

240
Bedroom 4 Width:

15
Laundry Room Length:

7
Laundry Room Width:

7

Financial & Terms

Listing Terms:

Cash

Location

Coordinates:

-105.28887, 40.01148
Latitude:

40.01148
Longitude:

-105.28887

The Property

Property Type:

Residential
Property Subtype:

Residential-Detached
Parcel Number:

R0000453
Lot Features:

Curbs
Lot Size Acres:

0.23
Lot Size SqFt:

9,947 Sqft
Lot Size Area:

9947
Lot Size Units:

Square Feet
Zoning:

RES
View:

Foothills View
Horse:

false
Fencing:

Fenced
Exterior Features:

Gas Grill
Waterfront:

false
Road Frontage Type:

City Street
Road Surface Type:

Paved
Has Water Rights:

No

Listing Agent

Contact info:

Taxes

Tax Year:

2024
Tax Annual Amount:

$25,584

Beds

Bedrooms Total:

4
Bedroom 2 Level:

Upper
Bedroom 2 Features:

Hardwood
Bedroom 3 Level:

Upper
Bedroom 3 Features:

Hardwood
Bedroom 4 Level:

Basement
Bedroom 4 Features:

Hardwood
Master Bedroom Level:

Upper
Master Bedroom Features:

Hardwood

Baths

Total Baths:

5
Full Baths:

4
Half Baths:

1
Master Bath Features:

Full Primary Bath, Tub+Shower Primary, Luxury Features Primary Bath

The Listing

Virtual Tour URL Unbranded:

https://www.listingsmagic.com/sps/tour-slider/index.php?property_ID=274207
Special Listing Conditions:

Private Owner

Heating & Cooling

Heating:

Forced Air
Heating:

true
Cooling:

Central Air
Cooling:

true

Utilities

Utilities:

Natural Gas Available
Gas:

Natural Gas, Xcel Energy
Electric:

Electric, Xcel Energy
Sewer:

City Sewer
Water Source:

City Water, City of Boulder

Appliances

Appliances:

Gas Range/Oven

Schools

Elementary School:

Flatirons
Middle School:

Manhattan
High School:

Boulder
High School District:

Boulder Valley Dist RE2

The Community

Association:

false
Subdivision Name:

Highland Lawn
Spa:

false
Senior Community:

false

Parking

Garage Spaces:

2
Garage:

true
Garage SqFt:

441 Sqft
Garage Type:

Detached
Attached Garage:

false
Covered Spaces:

2

Monthly cost estimate

Asking price

$4,985,000

Expense	Monthly cost
Mortgage	$26,693
Taxes	$2,132
Insurance	$2,326
Utilities	$223 See report
Total	$31,374/mo.^*
	^*This is an estimate

Explore the Area

My Commute

From

Walk Score®

Provided by WalkScore® Inc.

Bike Score®

Provided by WalkScore® Inc.

Transit Score®

Provided by WalkScore® Inc.

Soundscore™

Provided by HowLoud

Air Pollution Index

Provided by ClearlyEnergy

Sale history

Date	Event	Source	Price	% Change
6/19/25 Jun 19, 2025	Listed / Active	IRES	$4,985,000	43.2% (7.2% / YR)
6/18/19 Jun 18, 2019		IRES	$3,480,000

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This house located in Central Boulder - University Hill, Boulder, CO 80302 is currently for sale for $4,985,000. 512 Marine St is a 4,465 square foot house with 4 beds and 5 baths that has been on Estately for 18 days. 512 Marine St is in the Central Boulder - University Hill neighborhood of Boulder and has a WalkScore® of 65, making it somewhat walkable. This house is in the attendance area of Boulder High School, Manhattan Middle School Of The Arts And Academics, and Flatirons Elementary School.

Listing Courtesy of: IRES

TERMS OF USE: listing information is provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

Information deemed reliable but not guaranteed by the MLS