Main-Level living at its finest! Privately positioned on 0.57 acres behind a dramatic, illuminated gated driveway, this architecturally distinguished estate, renovated by Harvey Hine, reflects a refined mid-century modern aesthetic & offers a sophisticated balance of timeless design, privacy, and effortless livability. The main-floor primary suite offers a serene retreat with a generous walk-in closet & spa-inspired bath, allowing for luxurious single-level living. An oversized pivoting wood door provides an elegant introduction to the home. The living room features a vaulted ceiling, a statement tiled fireplace, & maple hardwood floors, while large windows & glass doors create a natural connection to the elevated rear deck, ideal for entertaining or quiet evenings at home. The chef's kitchen blends mid-century-inspired warmth with modern performance, featuring custom walnut cabinetry, a dramatic waterfall stone island, designer tile backsplash, walk-in pantry, Wolf range, & Sub-Zero refrigeration. A refined library lounge transitions to a flexible office or fifth bedroom with direct access to the front patio. The fully finished lower level includes a media lounge and private guest suite, with architectural renderings available to reimagine the space as a wellness retreat. Enjoy year-round peace of mind with a whole-house generator, providing backup power! Outdoors, the grounds unfold as a secluded oasis with towering 50-foot evergreens, natural boulders, a stone patio, a seasonal water feature, & multiple intimate seating areas. A heated bonus studio provides exceptional flexibility as a gym, art studio, or private office. With its scale, privacy, & layout, the property also presents compelling Sundance Film Festival 2027 rental potential. Ideally located on one of the most desirable streets in coveted Newlands, just minutes to downtown Boulder, open space, trails, shops, & schools. Explore the 3D tour and property video.
Sold for $3,438,500
$3,438,500
503 Kalmia Ave, Boulder, CO 80304
4beds
5,381sqft
Single Family Residence
Built in 1978
0.57 Acres Lot
$3,437,900 Zestimate®
$639/sqft
$7,474 Estimated rent
Home value
$3,437,900
$3.27M - $3.64M
$7,474/mo
Zestimate® history
Owner options
List your home for rent
$7,474/mo
Rent Zestimate®
Find your next renter with Zillow Rental Manager. Plus, with online applications, you can quickly screen prospective tenants – for free.
$7,474/mo
Rent Zestimate®
Refinance and save
$16,055/mo
Est. payment
Refinancing to a lower rate could help reduce your monthly payments and save thousands over the life of the loan.
$16,055/mo
Est. payment
Explore your selling options
Work with a Zillow partner agent
Leverage their expertise and Zillow's premium Showcase listings to get your home seen by more buyers.
Get startedList with your own agent
Get your home in front of millions of buyers by listing it on Zillow.
Learn how to do itSell it yourself
Take full control of how buyers see your home on Zillow by listing For Sale by Owner (FSBO).
List your homeWhat's special
Stone patioSpa-inspired bathMain-level livingDramatic illuminated gated drivewaySub-zero refrigerationRefined library loungeDramatic waterfall stone island
Zillow last checked:
Listing updated:
Listed by:
Sara Groem 303-522-4184,
Open Real Estate
Bought with:
John McElveen, 684465
milehimodern - Boulder
Source: IRES as distributed by MLS GRID,MLS#: 1050848
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 4
- Full bathrooms: 3
- 1/2 bathrooms: 1
- Main level bathrooms: 3
Rooms
- Room types: Media Room
Primary bedroom
- Description: Carpet
- Features: Luxury Features Primary Bath, 5 Piece Primary Bath
- Level: Main
- Area: 256 Square Feet
- Dimensions: 16 x 16
Bedroom 2
- Description: Carpet
- Level: Main
- Area: 224 Square Feet
- Dimensions: 14 x 16
Bedroom 3
- Description: Carpet
- Level: Main
- Area: 238 Square Feet
- Dimensions: 17 x 14
Bedroom 4
- Description: Carpet
- Level: Basement
- Area: 225 Square Feet
- Dimensions: 15 x 15
Dining room
- Description: Hardwood
- Level: Main
- Area: 195 Square Feet
- Dimensions: 15 x 13
Family room
- Description: Carpet
- Level: Basement
- Area: 345 Square Feet
- Dimensions: 23 x 15
Kitchen
- Description: Hardwood
- Level: Main
- Area: 238 Square Feet
- Dimensions: 17 x 14
Laundry
- Description: Tile
- Level: Main
- Area: 91 Square Feet
- Dimensions: 13 x 7
Living room
- Description: Hardwood
- Level: Main
- Area: 255 Square Feet
- Dimensions: 17 x 15
Study
- Description: Wood
- Level: Main
- Area: 216 Square Feet
- Dimensions: 18 x 12
Heating
- Forced Air
Cooling
- Central Air, Ceiling Fan(s)
Appliances
- Included: Gas Range, Dishwasher, Refrigerator, Microwave, Disposal
Features
- Eat-in Kitchen, Separate Dining Room, Open Floorplan, Workshop, Pantry, Walk-In Closet(s), Kitchen Island
- Windows: Window Coverings, Wood Frames
- Basement: Partial,Partially Finished,Sump Pump
- Has fireplace: Yes
- Fireplace features: Gas, Living Room
Interior area
- Total structure area: 3,329
- Total interior livable area: 5,381 sqft
- Finished area above ground: 3,329
Property
Parking
- Total spaces: 2
- Parking features: Garage Door Opener, RV Access/Parking, Attached, Oversized
- Attached garage spaces: 2
- Details: Attached
Accessibility
- Accessibility features: Level Lot, Level Drive, Main Floor Bath, Accessible Bedroom, Main Level Laundry
Features
- Levels: One
- Stories: 1
- Patio & porch: Patio, Deck
- Exterior features: Sprinkler System
- Fencing: Fenced,Wood
Lot
- Size: 0.57 Acres
- Features: Evergreen Trees, Deciduous Trees, Level, Abuts Ditch, City Limits, Paved
Details
- Additional structures: Storage
- Parcel number: R0077871
- Zoning: SFR
- Special conditions: Private Owner
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Contemporary
- Property subtype: Single Family Residence
Materials
- Frame
- Roof: Metal
Condition
- New construction: No
- Year built: 1978
Utilities & green energy
- Electric: Xcel
- Gas: Xcel
- Sewer: Public Sewer
- Water: City
- Utilities for property: Natural Gas Available, Electricity Available
Green energy
- Energy efficient items: Windows
Community & HOA
Community
- Security: Security System, Fire Alarm
- Subdivision: Newlands
HOA
- Has HOA: No
Location
- Region: Boulder
Financial & listing details
- Price per square foot: $639/sqft
- Tax assessed value: $4,639,700
- Annual tax amount: $28,250
- Date on market: 2/4/2026
- Listing terms: Cash,Conventional,FHA,VA Loan,1031 Exchange
- Exclusions: Staging furnishings and personal items
- Electric utility on property: Yes
- Road surface type: Asphalt
Price history
| Date | Event | Price |
|---|---|---|
| 5/26/2026 | Sold | $3,438,500-4.5%$639/sqft |
Source:  IRES as distributed by MLS GRID #1050848 Report a problem | ||
| 4/28/2026 | Pending sale | $3,600,000$669/sqft |
Source:  REcolorado as distributed by MLS GRID #IR1050848 Report a problem | ||
| 3/27/2026 | Price change | $3,600,000-5.3%$669/sqft |
Source: IRES as distributed by MLS GRID #1050848 Report a problem | ||
| 3/5/2026 | Price change | $3,800,000-1.3%$706/sqft |
Source: REcolorado as distributed by MLS GRID #IR1050848 Report a problem | ||
| 2/4/2026 | Listed for sale | $3,850,000-1.3%$715/sqft |
Source:  IRES as distributed by MLS GRID #1050848 Report a problem | ||
| 12/18/2025 | Listing removed | $3,900,000$725/sqft |
Source: IRES as distributed by MLS GRID #1039841 Report a problem | ||
| 10/2/2025 | Price change | $3,900,000-2.5%$725/sqft |
Source: IRES as distributed by MLS GRID #1039841 Report a problem | ||
| 8/12/2025 | Price change | $4,000,000-3.6%$743/sqft |
Source: IRES as distributed by MLS GRID #1039841 Report a problem | ||
| 7/9/2025 | Price change | $4,150,000-2.4%$771/sqft |
Source: IRES as distributed by MLS GRID #1027404 Report a problem | ||
| 6/13/2025 | Price change | $4,250,000-2.3%$790/sqft |
Source: IRES as distributed by MLS GRID #1027404 Report a problem | ||
| 6/3/2025 | Price change | $4,350,000-4.4%$808/sqft |
Source: IRES as distributed by MLS GRID #1027404 Report a problem | ||
| 4/21/2025 | Price change | $4,550,000-2.2%$846/sqft |
Source: IRES as distributed by MLS GRID #1027404 Report a problem | ||
| 4/2/2025 | Price change | $4,650,000-2.1%$864/sqft |
Source: IRES as distributed by MLS GRID #1027404 Report a problem | ||
| 2/28/2025 | Listed for sale | $4,750,000-4.9%$883/sqft |
Source: IRES as distributed by MLS GRID #1027404 Report a problem | ||
| 8/14/2024 | Listing removed | $4,995,000$928/sqft |
Source: IRES as distributed by MLS GRID #1014079 Report a problem | ||
| 7/16/2024 | Listed for sale | $4,995,000+65.1%$928/sqft |
Source: IRES as distributed by MLS GRID #1014079 Report a problem | ||
| 2/20/2019 | Sold | $3,025,000-4%$562/sqft |
Source: IRES as distributed by MLS GRID #870279 Report a problem | ||
| 1/27/2019 | Pending sale | $3,150,000$585/sqft |
Source: RE/MAX of Boulder #2633516 Report a problem | ||
| 1/22/2019 | Listed for sale | $3,150,000+9.6%$585/sqft |
Source: RE/MAX of Boulder #2633516 Report a problem | ||
| 7/11/2018 | Sold | $2,875,000-10.2%$534/sqft |
Source: Public Record Report a problem | ||
| 2/20/2018 | Listed for sale | $3,200,000$595/sqft |
Source: Porchlight RE Group-Boulder #842079 Report a problem | ||
| 8/19/2017 | Listing removed | $3,200,000$595/sqft |
Source: RE/MAX Alliance on Walnut #817153 Report a problem | ||
| 4/19/2017 | Listed for sale | $3,200,000+183.2%$595/sqft |
Source: RE/MAX Alliance on Walnut #817153 Report a problem | ||
| 11/1/2011 | Sold | $1,130,000$210/sqft |
Source: Public Record Report a problem | ||
| 5/31/2011 | Sold | $1,130,000-5%$210/sqft |
Source: Public Record Report a problem | ||
| 4/13/2011 | Listed for sale | $1,190,000+3.9%$221/sqft |
Source: RE/MAX of Boulder #652780 Report a problem | ||
| 5/15/2008 | Sold | $1,145,000+24.9%$213/sqft |
Source: Public Record Report a problem | ||
| 6/6/2006 | Sold | $917,000$170/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $28,250 +1.8% | $289,982 -10.8% |
| 2024 | $27,760 +34% | $325,131 -1% |
| 2023 | $20,719 +4.9% | $328,285 +47.1% |
| 2022 | $19,757 +10.4% | $223,109 -17.3% |
| 2021 | $17,893 | $269,783 +31.2% |
| 2020 | $17,893 +12.9% | $205,563 |
| 2019 | $15,843 | $205,563 +12.5% |
| 2018 | $15,843 | $182,736 -9.5% |
| 2017 | $15,843 +5.2% | $202,025 +16.1% |
| 2016 | $15,063 +5.6% | $174,005 +28.6% |
| 2015 | $14,264 +25.4% | $135,320 |
| 2014 | $11,378 +49.7% | $135,320 -8.1% |
| 2013 | $7,602 +0.9% | $147,173 +62.2% |
| 2012 | $7,535 -1.8% | $90,744 |
| 2011 | $7,676 +7.1% | -- |
| 2010 | $7,167 +12.9% | $94,970 |
| 2009 | $6,347 +3.5% | $94,970 -4.3% |
| 2008 | $6,130 -3.3% | $99,190 |
| 2007 | $6,338 +3.9% | $99,190 |
| 2006 | $6,102 +21.8% | $99,190 |
| 2005 | $5,010 +0.7% | $99,190 +21% |
| 2004 | $4,975 -8.5% | $82,000 |
| 2003 | $5,437 +10.3% | $82,000 +5.3% |
| 2002 | $4,928 | $77,900 -90.9% |
| 2001 | -- | $851,400 |
Find assessor info on the county website
Neighborhood: Juniper - Kalmia
Nearby homes
- $2,676,3004 bd3 ba2.2k sqft501 Kalmia Ave, Boulder, CO 80304Off Market
- $3,584,9005 bd4 ba3.6k sqft505 Kalmia Ave, Boulder, CO 80304Off Market
- $7,285,5007 bd1 ba9.3k sqft525 Kalmia Ave, Boulder, CO 80304Off Market
- $5,995,0004 bd5 ba5.9k sqft497 Kalmia Ave, Boulder, CO 80304For Sale
- $1,750,6003 bd2 ba1.5k sqft447 Kalmia Ave, Boulder, CO 80304Off Market
- $4,210,4003 bd2 ba3.3k sqft601 Kalmia Ave, Boulder, CO 80304Off Market
- $2,187,2005 bd2 ba2.1k sqft3650 4th St, Boulder, CO 80304Off Market
- $2,976,5004 bd2 ba2.7k sqft600 Linden Ave, Boulder, CO 80304Off Market
Nearby schools
GreatSchools rating
- 8/10Foothill Elementary SchoolGrades: K-5Distance: 0.4 mi
- 7/10Centennial Middle SchoolGrades: 6-8Distance: 1.2 mi
- 10/10Boulder High SchoolGrades: 9-12Distance: 2 mi
Schools provided by the listing agent
- Elementary: Foothill
- Middle: Casey
- 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.
Get a cash offer in 3 minutes
Find out how much your home could sell for in as little as 3 minutes with a no-obligation cash offer.
Estimated market value
$3,437,900
Get a cash offer in 3 minutes
Find out how much your home could sell for in as little as 3 minutes with a no-obligation cash offer.
Estimated market value
$3,437,900
- Colorado
- Boulder County
- Boulder
- 80304
- Juniper - Kalmia
- 503 Kalmia Ave
Nearby cities
Nearby neighborhoods
Nearby zip codes
Other Boulder Topics
