Seller's Agent in 2025
Zachary Zeldner
Coldwell Banker Realty 02
(720) 480-7650
255 Total Sales
3500 Bison Dr Boulder, CO 80302
3
Beds
2.5
Baths
2,705
Sq Ft
37.53
Acres
Highlights
- 37.53 Acre Lot
- Open Floorplan
- Contemporary Architecture
- Flatirons Elementary School Rated A
- Deck
- Wooded Lot
About This Home
As of September 2025Nestled on 37.5 acres just 20 mins from downtown Boulder, this stunning sanctuary with incredible views is an award-winning custom completion by HMH Architecture. Originally a 1980s mountain cabin, the property has been meticulously transformed into a foothills oasis that seamlessly blends industrial materials with natural textures & peaceful solitude. The home's entry is a masterpiece of design, featuring a sculptural staircase that combines black concrete lower steps with LED lighting and an upper flight of glass and steel. Above, you're welcomed into an expansive open-concept living space where the kitchen takes center stage & is a testament to intentional design, with custom blackened-steel cabinetry, while paneled appliances maintain a clean aesthetic, ensuring the kitchen remains an integrated part of the living space. Overhead, white-oak planks and a cold-rolled steel beam pay homage to the home's original timber rafters. Expansive floor-to-ceiling windows offer breathtaking views of the surrounding peaks wilderness to the south. An exterior custom steel bridge leads from the kitchen to an outdoor patio. For chefs, the outdoor pizza oven and hidden custom wok burner inspire al fresco cooking. The primary bedroom features a white oak ceiling and handmade blown-glass pendant lights. The adjoining bathroom is a design marvel featuring a soaking tub and glass-paneled shower resting on ash floors. The lower level features two guest bedrooms, laundry room and mudroom. The exterior of the home is equally impressive, featuring a mix of neutral stucco and weathering steel. Three miles of private trails meander throughout the property, which sits on the western border of the 9,000-acre Boulder Mountain Park, offering back-door access to open space and nearby trails. This home offers a peaceful retreat amidst Colorado's untouched wilderness. With expansive views and abundant wildlife, it's a sanctuary that feels connected to nature, while still being close to the city.
Home Details
Home Type
- Single Family
Est. Annual Taxes
- $8,711
Year Built
- Built in 1988
Lot Details
- 37.53 Acre Lot
- Open Space
- Southern Exposure
- Rock Outcropping
- Wooded Lot
- Landscaped with Trees
Parking
- 2 Car Attached Garage
Home Design
- Contemporary Architecture
- Metal Roof
- Metal Siding
- Stucco
Interior Spaces
- 2,705 Sq Ft Home
- 2-Story Property
- Open Floorplan
- Bar Fridge
- Beamed Ceilings
- Cathedral Ceiling
- Pendant Lighting
- Fireplace
- Triple Pane Windows
- Window Treatments
- Mud Room
- Dining Room
- Home Office
- Wood Flooring
- Property Views
Kitchen
- Eat-In Kitchen
- Double Oven
- Electric Oven or Range
- Microwave
- Dishwasher
- Kitchen Island
- Disposal
Bedrooms and Bathrooms
- 3 Bedrooms
- Walk-In Closet
- Primary Bathroom is a Full Bathroom
- Jack-and-Jill Bathroom
- Bidet
- Soaking Tub
- Steam Shower
Laundry
- Laundry Room
- Laundry on lower level
- Dryer
- Washer
Outdoor Features
- Deck
- Patio
- Outdoor Storage
- Outdoor Gas Grill
Schools
- Flatirons Elementary School
- Manhattan Middle School
- Boulder High School
Utilities
- Central Air
- Radiant Heating System
- Propane
- Septic System
Community Details
- No Home Owners Association
- Walker Ranch Subdivision
Listing and Financial Details
- Assessor Parcel Number R0080997
Ownership History
Date
Name
Owned For
Owner Type
Purchase Details
Listed on
Jan 10, 2025
Closed on
Aug 26, 2025
Sold by
Marks Milne R and Marks Krista M
Bought by
Seekers On The Ridge Llc
Seller's Agent
Zachary Zeldner
Coldwell Banker Realty 02
Buyer's Agent
Zachary Zeldner
Coldwell Banker Realty 02
List Price
$3,400,000
Sold Price
$2,800,000
Premium/Discount to List
-$600,000
-17.65%
Views
180
Current Estimated Value
Home Financials for this Owner
Home Financials are based on the most recent Mortgage that was taken out on this home.
Estimated Appreciation
-$59,074
Avg. Annual Appreciation
-5.32%
Purchase Details
Listed on
Jun 23, 2015
Closed on
Jul 31, 2015
Sold by
Ciufolo Michael A and Ciufolo Susan A
Bought by
Marks Krista M
Seller's Agent
Julie Gullett
Kentwood Real Estate Boulder Valley
Buyer's Agent
Mike Malec
List Price
$769,000
Sold Price
$740,000
Premium/Discount to List
-$29,000
-3.77%
Home Financials for this Owner
Home Financials are based on the most recent Mortgage that was taken out on this home.
Avg. Annual Appreciation
14.05%
Purchase Details
Closed on
Jul 18, 2005
Sold by
Ciufolo Michael A
Bought by
Ciufolo Michael A
Purchase Details
Closed on
Mar 28, 1988
Bought by
Marks Krista M and Marks Brent Milne
Purchase Details
Closed on
May 12, 1979
Bought by
Marks Krista M and Marks Brent Milne
Create a Home Valuation Report for This Property
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Purchase History
| Date | Type | Sale Price | Title Company |
|---|---|---|---|
| Special Warranty Deed | $2,800,000 | Fidelity National Title | |
| Warranty Deed | $740,000 | Heritage Title | |
| Interfamily Deed Transfer | -- | -- | |
| Warranty Deed | $53,000 | -- | |
| Deed | $52,000 | -- |
Source: Public Records
Property History
| Date | Event | Price | List to Sale | Price per Sq Ft | Prior Sale |
|---|---|---|---|---|---|
| 09/08/2025 09/08/25 | Sold | $2,800,000 | -13.8% | $1,035 / Sq Ft | |
| 05/13/2025 05/13/25 | Price Changed | $3,250,000 | -4.4% | $1,201 / Sq Ft | |
| 01/10/2025 01/10/25 | For Sale | $3,400,000 | +359.5% | $1,257 / Sq Ft | |
| 01/28/2019 01/28/19 | Off Market | $740,000 | -- | -- | |
| 07/30/2015 07/30/15 | Sold | $740,000 | -3.8% | $275 / Sq Ft | View Prior Sale |
| 06/30/2015 06/30/15 | Pending | -- | -- | -- | |
| 06/23/2015 06/23/15 | For Sale | $769,000 | -- | $285 / Sq Ft |
Source: IRES MLS
Tax History
| Year | Tax Paid | Tax Assessment Tax Assessment Total Assessment is a certain percentage of the fair market value that is determined by local assessors to be the total taxable value of land and additions on the property. | Land | Improvement |
|---|---|---|---|---|
| 2025 | $8,848 | $90,469 | $23,444 | $67,025 |
| 2024 | $8,848 | $90,469 | $23,444 | $67,025 |
| 2023 | $8,711 | $95,656 | $32,408 | $66,933 |
| 2022 | $6,908 | $70,723 | $20,106 | $50,617 |
| 2021 | $6,588 | $72,758 | $20,685 | $52,073 |
| 2020 | $5,945 | $62,820 | $25,454 | $37,366 |
| 2019 | $4,963 | $53,260 | $25,454 | $27,806 |
| 2018 | $4,489 | $47,671 | $23,472 | $24,199 |
| 2017 | $4,360 | $52,704 | $25,950 | $26,754 |
| 2016 | $5,727 | $60,265 | $34,865 | $25,400 |
| 2015 | $4,678 | $50,148 | $27,860 | $22,288 |
| 2014 | $3,900 | $50,148 | $27,860 | $22,288 |
Source: Public Records
Agents Affiliated with this Home
-
Zachary Zeldner
-
Ethan Bullock
Seller Co-Listing Agent in 2025
Ethan Bullock
Coldwell Banker Realty 02
(303) 487-5472
167 Total Sales
-
Julie Gullett
Seller's Agent in 2015
Julie Gullett
Kentwood Real Estate Boulder Valley
(303) 408-6966
33 Total Sales
-
Mike Malec
Buyer's Agent in 2015
Mike Malec
(303) 588-5716
41 Total Sales
Map
Source: IRES MLS
MLS Number: IRE1024342
APN: 1579001-00-013
Disclaimer: Certain information contained herein is derived from information provided by parties other than Homes.com. All information provided is deemed reliable, but is not guaranteed to be accurate and should be independently verified.
Information source: Information and Real Estate Services, LLC. Provided for limited non-commercial use only under IRES Rules © Copyright IRES.
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.
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