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.
Sold for $4,650,000
$4,650,000
512 Marine St, Boulder, CO 80302
4beds
4,904sqft
Single Family Residence
Built in 1903
9,947 Square Feet Lot
$4,614,900 Zestimate®
$948/sqft
$7,317 Estimated rent
Home value
$4,614,900
$4.29M - $4.94M
$7,317/mo
Zestimate® history
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Zillow last checked:
Listing updated:
Listed by:
Maureen McCarthy 303-817-1282,
RE/MAX of Boulder, Inc
Bought with:
Bianca Griffith, 100097818
RE/MAX of Boulder, Inc
Source: IRES as distributed by MLS GRID,MLS#: 1044486
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 5
- Full bathrooms: 4
- 1/2 bathrooms: 1
- Main level bathrooms: 1
Primary bedroom
- Description: Hardwood
- Features: Full Primary Bath, Luxury Features Primary Bath
- Level: Upper
- Area: 405 Square Feet
- Dimensions: 27 x 15
Bedroom 2
- Description: Hardwood
- Level: Upper
- Area: 156 Square Feet
- Dimensions: 13 x 12
Bedroom 3
- Description: Hardwood
- Level: Upper
- Area: 169 Square Feet
- Dimensions: 13 x 13
Bedroom 4
- Description: Hardwood
- Level: Basement
- Area: 240 Square Feet
- Dimensions: 15 x 16
Dining room
- Description: Hardwood
- Level: Main
- Area: 182 Square Feet
- Dimensions: 14 x 13
Family room
- Description: Hardwood
- Level: Main
- Area: 350 Square Feet
- Dimensions: 25 x 14
Kitchen
- Description: Hardwood
- Level: Main
- Area: 250 Square Feet
- Dimensions: 25 x 10
Laundry
- Description: Tile
- Level: Upper
- Area: 49 Square Feet
- Dimensions: 7 x 7
Living room
- Description: Hardwood
- Level: Main
- Area: 253 Square Feet
- Dimensions: 11 x 23
Study
- Description: Hardwood
- Level: Basement
- Area: 81 Square Feet
- Dimensions: 9 x 9
Heating
- Forced Air
Cooling
- Central Air
Appliances
- Included: Gas Range, Double Oven, Refrigerator, Bar Fridge, Washer, Dryer, Microwave, Gas Bar-B-Q, Water Purifier Owned
- Laundry: Washer/Dryer Hookup
Features
- Eat-in Kitchen, Separate Dining Room, Open Floorplan, Pantry, Walk-In Closet(s), Kitchen Island, High Ceilings
- Flooring: Wood
- Windows: Window Coverings, Wood Frames
- Basement: Full,Partially Finished,Built-In Radon,Sump Pump
- Has fireplace: Yes
- Fireplace features: Two or More, Gas, Living Room, Family Room, Bedroom
Interior area
- Total structure area: 3,245
- Total interior livable area: 4,904 sqft
- Finished area above ground: 3,245
Property
Parking
- Total spaces: 2
- Parking features: Garage
- Garage spaces: 2
- Details: Detached
Features
- Levels: Two
- Stories: 2
- Patio & porch: Patio
- Exterior features: Sprinkler System, Balcony
- Fencing: Fenced
- Has view: Yes
- View description: Hills
Lot
- Size: 9,947 sqft
- Features: Wooded, Deciduous Trees, Level, Paved, Curbs, Gutters, Sidewalks
Details
- Parcel number: R0000453
- Zoning: RES
- Special conditions: Private Owner
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Victorian
- Property subtype: Single Family Residence
Materials
- Frame, Brick
- Roof: Composition
Condition
- New construction: No
- Year built: 1903
Utilities & green energy
- Electric: Xcel Energy
- Gas: Xcel Energy
- Sewer: Public Sewer
- Water: City
- Utilities for property: Natural Gas Available, Electricity Available, Cable Available
Community & neighborhood
Security
- Security features: Fire Alarm
Location
- Region: Boulder
- Subdivision: Highland Lawn
Other
Other facts
- Listing terms: Cash,Conventional
- Road surface type: Asphalt
Price history
| Date | Event | Price |
|---|---|---|
| 11/21/2025 | Sold | $4,650,000-2.1%$948/sqft |
Source:  IRES as distributed by MLS GRID #1044486 Report a problem | ||
| 10/24/2025 | Pending sale | $4,750,000$969/sqft |
Source:  REcolorado as distributed by MLS GRID #8483246 Report a problem | ||
| 9/26/2025 | Listed for sale | $4,750,000-4.7%$969/sqft |
Source: IRES as distributed by MLS GRID #1044486 Report a problem | ||
| 9/24/2025 | Listing removed | $4,985,000$1,017/sqft |
Source: IRES as distributed by MLS GRID #1036876 Report a problem | ||
| 6/19/2025 | Listed for sale | $4,985,000+43.2%$1,017/sqft |
Source: IRES as distributed by MLS GRID #1036876 Report a problem | ||
| 6/18/2019 | Sold | $3,480,000+54.7%$710/sqft |
Source: Public Record Report a problem | ||
| 10/30/2012 | Sold | $2,250,000-4.3%$459/sqft |
Source: Public Record Report a problem | ||
| 8/28/2012 | Listed for sale | $2,350,000+14.6%$479/sqft |
Source: Goodacre & Company #689911 Report a problem | ||
| 5/27/2008 | Sold | $2,050,000+192.9%$418/sqft |
Source: Public Record Report a problem | ||
| 1/22/2007 | Sold | $700,000$143/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $25,584 +1.8% | $286,607 -2.8% |
| 2024 | $25,140 +11.4% | $294,793 -1% |
| 2023 | $22,558 +4.9% | $297,653 +22.5% |
| 2022 | $21,511 +6.9% | $242,917 -2.8% |
| 2021 | $20,115 | $249,907 +8.1% |
| 2020 | $20,115 +15.2% | $231,082 |
| 2019 | $17,459 | $231,082 +14.8% |
| 2018 | $17,459 | $201,369 -9.5% |
| 2017 | $17,459 +9.8% | $222,625 +21.2% |
| 2016 | $15,900 +5.6% | $183,677 +22.7% |
| 2015 | $15,056 +19.6% | $149,679 |
| 2014 | $12,585 +19.1% | $149,679 |
| 2013 | $10,569 +0.9% | $149,679 +18.6% |
| 2012 | $10,476 -12.1% | $126,166 |
| 2011 | $11,913 +7.1% | -- |
| 2010 | $11,124 +185.3% | $147,400 |
| 2009 | $3,899 +3.5% | $147,400 +141.9% |
| 2008 | $3,766 +8.4% | $60,930 |
| 2007 | $3,473 +3.9% | $60,930 +12.1% |
| 2006 | $3,344 +9.8% | $54,350 -7% |
| 2005 | $3,045 +0.7% | $58,420 +17.2% |
| 2004 | $3,023 +4.6% | $49,830 |
| 2003 | $2,891 +10.3% | $49,830 +20.3% |
| 2002 | $2,620 | $41,430 -90.9% |
| 2001 | -- | $452,800 |
Find assessor info on the county website
Neighborhood: Flatirons
Nearby schools
GreatSchools rating
- 6/10Flatirons Elementary SchoolGrades: K-5Distance: 0.3 mi
- 5/10Manhattan Middle School Of The Arts And AcademicsGrades: 6-8Distance: 3.4 mi
- 10/10Boulder High SchoolGrades: 9-12Distance: 0.7 mi
Schools provided by the listing agent
- Elementary: Flatirons
- Middle: Manhattan
- High: Boulder
Source: IRES as distributed by MLS GRID. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
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Estimated market value
$4,614,900
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Estimated market value
$4,614,900
- Colorado
- Boulder County
- Boulder
- 80302
- Flatirons
- 512 Marine St
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