See Home Value
$2,221,785
● House - Off Market

860 Union Ave

Boulder, CO 80304
bedrooms
5 Beds
bathrooms
4 Baths
square feet
3,840 Ft²
$12,914
Est. Monthly

About This Property

A striking architectural residence in one of North Boulder's most desirable pockets, perfectly positioned between Wonderland Lake and Foothills Community Park offering immediate access to miles of trails, open space, and some of North Boulder's most coveted outdoor amenities. This 5-bedroom, 4-bath masterpiece offers over 4,000 square feet of thoughtfully designed living. Masterfully designed by architect JV DeSousa, the home is defined by clean lines, abundant natural light, soaring ceilings and a sense of volume and ease throughout. The open-concept main level is both refined and highly livable, anchored by custom artistic elements by local artist Osbourne Sculpture, including a statement fireplace, sculptural railing, and bespoke kitchen island. The flexible layout offers true versatility, featuring a spacious main-level office that easily converts to a guest suite with a built-in Murphy bed and access to an ensuite full bath. Function is seamlessly integrated with walk-in closets, built-in dressers, generous shelving, and a well-appointed laundry/mudroom with utility sink and custom cubbies. An oversized garage adds storage and convenience, while recent system upgrades, including two new furnaces, A/C systems, and solar panels producing energy beyond current usage, enhance efficiency and long-term value. Thoughtful capital improvements have been made throughout, including an extension of the outdoor living experience with a composite deck, wood fencing, a premium pergola, and low-water landscaping creating a private, low-maintenance setting designed for both relaxation and entertaining. The fully finished lower level expands the living space with a versatile layout, complete with built-in Murphy bunk beds, ideal for guests, media, or play. Fresh, intentionally minimal and architecturally distinct, this home offers a refined backdrop and a rare opportunity to own a truly enduring piece of North Boulder.
Unit Size
3,840 Ft²
Days on Market
-
Land Size
0.15 acres
Price per sqft
$625
Property Type
House
Property Taxes
$1,129
HOA Dues
-
Year Built
2001

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Last updated: 2 months ago (REcolorado MLS #IRE2663653)

Price History

Date / Event Date Event Price
Sep 11, 2026 Sold
Sold
Aug 4, 2026 In contract -
In contract
Jul 21, 2026 Price Decreased $2,400,000
↓ $50K (2%)
Price Decreased
Jun 16, 2026 Price Decreased $2,450,000
↓ $75K (3%)
Price Decreased
May 15, 2026 Price Decreased $2,525,000
↓ $70K (2.7%)
Price Decreased
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Property Highlights

Garage
Air Conditioning
Fireplace

Building Info

Overview

    General

  • Year Built: 2001
  • Effective Year Built: 2001
  • Building Count: 1
  • Total Rooms: 9
  • Bedroom Count: 5
  • Bathroom Count: 4
  • Full Bathrooms: 3
  • Partial Bathrooms: 4
  • Building Condition: 7
  • Building Quality: 4
  • Construction Type: 6
  • Building Style: 2
  • Exterior Walls Type: 16
  • Interior Walls Type: 3
  • Roof Shape Type: 0
  • Roof Cover Type: 15
  • Floor Count: 200
  • Living Units: 1
  • Floor Cover: 0
  • Basement Type: 6
  • Basement Area: 1,378
  • Garage Type: 1
  • Garage Square Area: 460
  • Parking Space Count: 2
  • Patio Type: 20
  • Porch Type: 8
  • Pool Type: 0

    Dimensions

  • Lot Size Square Feet: 6,412
  • Total Building Area: 4,778
  • Gross Building Area: 4,778
  • Building Area: 3,840
  • Building Area Measurement: L

    Heating and Cooling

  • Air Conditioning: 1
  • Heating: 4
  • Heated Square Feet: 3,840
  • Heating Fuel Type: 0

    Utilities

  • Sewer System: 0
  • Water Service: 0

Building

  • Building Type: 0
  • Property Class: R
  • Subdivision: MAKENA TAYLOR SUB - BO
  • Land Acres: 0000000147
  • Standard Land Use Code: 1001
  • County Land Use Code: 1112
  • Legal Description 1: LOT 1 MAKENA TAYLOR SPLIT SEE ID 106168-106170

Neighborhood

  • School District Name: Boulder Valley School District RE-2
  • Census Tract: 012104

Geography

  • Assessors Map Reference: B3-L
  • Account Number: R0034008
  • Parcel: R0034008
  • Lot: 1
  • Meridian: SEC 13 TWN 1N RNG 71
  • Municipality: BOULDER
  • Latitude: 40.0528
  • Longitude: -105.287

    Address

  • Full Address: 860 Union Ave
  • Address - House Number: 860
  • Address - Street Name: Union
  • Address - Suffix Type: Ave
  • State: CO
  • City Name: Boulder
  • Carrier Code: C082
  • 4-Digit Zip Code: 0709
  • Zip Code: 80304

Valuation

    Tax

  • Tax Year: 2022
  • Tax Amount: $1,185,744
  • Tax Rate Code Area: 00-010

    Appraisal Valuation

  • Standard Deviation: 0.1714
  • Valuation Date: May 17, 2023
  • Confidence Score: 78
  • Final Value: 2,439,254
  • High Value: 2,857,370
  • Low Value: 2,021,139

    Market Valuation

  • Market Total Value: $2,381,500
  • Market Land Value: $971,400
  • Market Improvement Value: $1,410,100

    Assessments Valuation

  • Assessed Year: 2023
  • Assessed Total Value: $161,108
  • Assessed Land Value: $65,715
  • Assessed Improvements Value: $95,393

    Sales

  • Current Sale Contract Date: Nov 17, 2015
  • Current Sale Recording Date: Nov 18, 2015
  • Current Sale Price:
  • Current Sale Document Type: 71
  • Current Sale Input Document Number: 3486022
  • Previous Sale Recording Date: Apr 23, 2002
  • Previous Sale Contract Date: Apr 22, 2002
  • Previous Sale Amount: $849,000
  • Previous Sale Document Type: 71
Data used for valuation calculations is provided by RealtyHop, and other third party sources

Comparables

Unit
Status
Type
Beds
Baths
ft²
Price/ft²
Asking Price
Listed On
Closing Price
Sold On
HOA + Taxes

About North Boulder


Similar Homes for Sale

Currently no similar homes around

Nearby Rentals

Unit for rent at 1240 Cedar Ave, CO, 80304

$1,642 /mo

  • 1 Bed
  • 1 Bath
1240 Cedar Ave, CO, 80304 Listing by Rick Rivera


Frequently Asked Questions

When was property at 860 Union Avenue built and last sold?
The property at 860 Union Avenue was built in 2001 and last sold on Nov 17, 2015 for $1,325,000.
How much is this home worth?
The estimated value of the home located at 860 Union Avenue is $2,424,000.
What are some comparable homes to 860 Union Avenue?
There are currently no comparable homes to 860 Union Avenue.