Perfectly located on one of Boulder's most idyllic streets, this exceptional home blends Victorian charm with luxurious modern amenities. The homes' traditional exterior gives way to a welcoming main level that features light-filled spaces, soaring ceilings, a formal dining room perfected for entertaining, and an array of spaces that welcome the outdoors in. The chef's kitchen features a new Sub-Zero fridge, Wolf range, granite topped island, and a walk-in pantry that makes organization easy. Don't miss the cleverly-designed under stair office with secret bookshelf, one of the many special touches that make this home so unique.Upstairs the primary suite features two fireplaces, a generous soaking tub and steam shower in the spa-like bath, soaring ceilings and mountain views. Two more light-filled bedrooms, two full baths and a dedicated laundry room complete the second floor. The lower level includes the large fourth bedroom with an en-suite bath, impressive ceiling height, an office, third living room, and an abundance of useful built-in storage. Step outside to a peaceful retreat of a backyard that includes a waterfall feature, plumbed-in BBQ, multiple outdoor patios, a two story playhouse, and an array of flowers and fruit trees. The separate backyard cottage with vaulted ceilings, a kitchenette, and powder bath creates the ultimate flexibility for a gym, home office, or guest house. The two car garage with epoxy floors and additional storage adds to the comfort and convenience of the home.Walk to trails, downtown restaurants, and all the best that Boulder has to offer. This is Boulder living at its best
Flatirons, located between Chautauqua Park and Downtown Boulder, is a foothills and residential Boulder neighborhood with sandstone backdrops and trail-first streets. The neighborhood’s character concentrates around the Chautauqua Auditorium lawn, where picnic blankets, hikers, and porch-lit cottages set an unhurried rhythm. Historic Craftsman homes and classic Boulder bungalows line leafy blocks, with the Flatirons rising like a constant compass point. Chautauqua Dining Hall anchors the local table, while the Colorado Chautauqua Association keeps the calendar tuned to talks, concerts, and community gatherings. Paths and stair-stepped lanes lead toward open space, and the daily soundtrack shifts from birdsong to amphitheater applause.
Provided by Walk Score and Local Logic
Offer insights
512 Marine St · $4,650,000
$4.64M and above
75% chance or better to win
Why $4.64M+ is a strong offer
DAYS ON MARKET
19 days
The average home goes pending in 49 days.
SALE-TO-LIST
98.3%
Most homes are selling 2% below list price.
About offer insights
Property details
Interior
Exterior
Finance
Kitchen
Bathroom
Bedroom
Living
Dining
Interior features
Eat-in kitchen
Separate dining room
Open floor plan
Pantry
Walk-in closets
Kitchen island
High ceilings
Fire alarm
Bedrooms
4 bedrooms (all conforming)
Bathrooms
4 full bathrooms
1 half bathroom
3 full baths on upper level
1 full bath in basement
1 half bath on main level
Kitchen
Gas range
Double oven
Refrigerator
Bar fridge
Microwave
Water purifier (owned)
Gas bar-b-q connection
Laundry & utility
Washer
Dryer
Sump pump
Flooring
Wood flooring
Heating & cooling
Forced air heating
Central air conditioning
Exterior features
Patio
Balcony
Sprinkler system
Fenced yard
Wooded lot with deciduous trees
Level terrain
Paved with curbs, gutters and sidewalks
Home design
Single-family residence
Two levels
Above-grade finished area approximately 3,238
Parking
Attached 2-car garage
Construction
Frame and brick construction
Composition roof
Full basement, partially finished
Built-in radon mitigation
Utilities
City water (meter installed)
Public sewer
Natural gas available
Electricity available
HOA & community
No association fees
Electricity and solar
View estimated energy costs and solar savings for this home
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.
IRES as Distributed by MLS Grid #1044486
Nov 21, 2025
Sold
$4,650,000
$921/sq ft
Oct 24, 2025
Contingent
—
Sep 25, 2025
Listed
$4,750,000
$941/sq ft
Public Remarks
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.
IRES as Distributed by MLS Grid #1036876
Sep 24, 2025
Listing Removed
—
Jun 19, 2025
Listed
$4,985,000
$988/sq ft
Jun 14, 2025
Coming Soon
*
IRES as Distributed by MLS Grid #885382
Jun 18, 2019
Sold
$3,480,000
$689/sq ft
Jun 18, 2019
Listed
$3,495,000
$692/sq ft
Public Records
Oct 30, 2012
Sold
$2,250,000
$446/sq ft
IRES as Distributed by MLS Grid #689911
Oct 29, 2012
Listing Removed
—
Oct 29, 2012
Sold
$2,250,000
$446/sq ft
Sep 4, 2012
Contingent
—
Aug 27, 2012
Listed
$2,350,000
$466/sq ft
IRES as Distributed by MLS Grid #535961
May 20, 2008
Sold
$2,050,000
$406/sq ft
Jun 13, 2007
Listed
$2,150,000
$426/sq ft
IRES as Distributed by MLS Grid #515787
Jan 19, 2007
Sold
$700,000
$139/sq ft
Dec 6, 2006
Listed
$720,000
$143/sq ft
Public Records
Apr 27, 1982
Sold
$85,000
$17/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$27,328 (+6.8%)
$93,644 + $192,963
$286,607
2024
$25,584 (+1.8%)
$93,644 + $192,963
$286,607
2023
$25,140 (+11.4%)
$90,651 + $200,457
$291,108
2022
$22,558 (+4.9%)
$94,336 + $200,457
$294,793
2021
$21,511 (+6.9%)
$71,335 + $171,582
$242,917
2020
$20,115 (+1.6%)
$73,388 + $176,519
$249,907
2019
$19,807 (+13.4%)
$92,450 + $138,632
$231,082
2018
$17,459 (+3.2%)
$92,450 + $138,632
$231,082
2017
$16,912 (+6.4%)
$80,568 + $120,801
$201,369
2016
$15,900 (+5.6%)
$80,568 + $120,801
$201,369
2015
$15,056 (+17.0%)
$73,471 + $110,206
$183,677
2014
$12,868 (+2.2%)
$81,510 + $68,169
$149,679
2013
$12,585 (+19.1%)
$81,510 + $68,169
$149,679
2012
$10,569 (+0.9%)
$81,510 + $68,169
$149,679
2011
$10,476 (−12.1%)
$30,726 + $95,440
$126,166
2010
$11,913 (+7.1%)
$30,726 + $95,440
$126,166
2009
$11,124
$35,820 + $111,580
$147,400
Public record
Public record
Zoning
Beds
4
Baths
4.5
Stories
—
Lot width
—
Lot depth
—
Lot size
9,947 Sq. Ft.
Year renovated
2000
Finished Sq. Ft.
4,348
Unfinished Sq. Ft.
—
Total Sq. Ft.
4,348
Year built
1903
Style
Single Family Residential
County
Boulder County
APN
R0000453
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Sep 2, 2026.
RL-1
Residential-Low 1 District
Primarily single-family detached dwelling units with some duplexes and attached dwelling units at low to very low residential densities.
Permitted uses
Include but are not limited to:
Religious facility
Housing-Multiple units
Educational/school
Recreation
Agriculture-Cropland
Park & open space
Local insights from Redfin agents
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