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661 Maxwell AvenueBoulder, CO 80304

For Sale

$4,975,000

Smart Buyer Rebate $49,750

A rare find in Mapleton Hill! Beautifully remodeled down to the studs in 2020 and complemented by a brand-new $1,000,000 ADU, this unique home brings together historic charm, gorgeous modern finishes and exceptional flexibility. Filled with natural light, the home offers an inviting flow with spaces that feel both connected and comfortable. Exposed brick adds warmth and character, while hardwood floors and thoughtfully chosen finishes create a cohesive feel throughout. The custom kitchen is a standout, featuring Wolf appliances, a Sub-Zero refrigerator and a charming built-in corner table-the perfect gathering spot for morning coffee or a casual meal. The main level includes a spacious study, a bedroom, a full bath and a powder room, providing wonderful options for guests and working from home. An elegant staircase with custom treads and metal detailing leads upstairs to the primary suite, where a generous deck captures foothill views and beautiful sunsets. It's a lovely place to start the day or unwind in the evening. The walkout lower level expands the living space with a recreation room, two additional bedrooms and a three-quarter bath, offering room to spread out and host guests comfortably. Adding to this exceptional property is the brand-new ADU with high end finish, bringing another dimension to the home's versatility and appeal. Walk to the Mount Sanitas trails for a morning hike or head to Pearl Street for shopping, dining and all the energy of downtown Boulder. With its blend of timeless character, modern comfort and a coveted Mapleton Hill setting, 661 Maxwell captures the best of Boulder living and with the Sundance Film Festival coming to Boulder in 2027, this location offers even more to look forward to. The main house is 3048 sq ft. ADU 1063 with a separate entrance basement 576 sq ft (great for storage!)

Listed by Karolyn Merrill

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License #IRP11787

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RE/MAX of Boulder, Inc

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303-817-2827

Listed by Patrick Dolan

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License #IRP09322

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RE/MAX of Boulder, Inc

Last updated October 24, 2026

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Source: REColorado #IR1070334

Listing Facts

  • TypeSingle-family
  • NeighborhoodMapleton Hill
  • Bedrooms5
  • Bathrooms6
  • Days on Prevu23
  • Taxes$15,843/year
  • Size4,111 sqft
  • Price per sqft$1,210

Amenities

  • Dishwasher
  • Private Outdoor Space
  • Washer/Dryer
  • Air Conditioning
  • Parking

Location

Mortgage Calculator

Listing History

10/15/2026
Status changed to Active
$4,975,000
10/08/2026
Listed by RE/MAX of Boulder, Inc
$4,975,000
  1. 10/15/2026$4,975,000
    Status changed to Active
  2. 10/08/2026$4,975,000
    Listed by RE/MAX of Boulder, Inc

Property Details for 661 Maxwell Avenue

Exterior

Construction

  • Roof: Composition
  • Structure Type: House
  • Year Built: 1910
  • Construction Materials: Brick

Features

  • Fencing: Partial
  • Patio And Porch Features: Deck, Patio
  • View: Mountain(s)

Measurements

  • Building Area Total: 4,687
  • Lot Features: Sprinklers In Front
  • Lot Size Acres: 0.16
  • Lot Size Square Feet: 6,898

Financial

Taxes

  • Parcel Number: R0008550
  • Tax Annual Amount: $15,843.00
  • Tax Year: 2025

Interior

Features

  • Appliances: Dishwasher, Disposal, Dryer, Microwave, Oven, Refrigerator, Self Cleaning Oven, Washer
  • Fireplace Features: Gas, Living Room
  • Flooring: Wood
  • Interior Features: Eat-in Kitchen, In-Law Floorplan, Open Floorplan, Pantry, Walk-In Closet(s)

Measurements

  • Living Area: 4,111

Rooms

  • Basement: Full, Unfinished, Walk-Out Access
  • Has Basement: Yes
  • Bathrooms Full: 2
  • Bathrooms Half: 1
  • Bathrooms Three Quarter: 3
  • Bathrooms Total Integer: 6
  • Bedrooms Total: 5
  • Main Level Bathrooms: 2
  • Main Level Bedrooms: 1

Other

Location

  • Subdivision Name: Mapleton Hill

Schools

Elementary School

  • Elementary School: Whittier E-8
  • Elementary School District: Boulder Valley RE 2

High School

  • High School: Boulder
  • High School District: Boulder Valley RE 2

Middle or Junior School

  • Middle Or Junior School: Casey

Utilities

Equipment

  • Cooling: Ceiling Fan(s), Central Air, Ductless
  • Heating: Forced Air, Radiant
  • Laundry Features: In Unit
  • Sewer: Public Sewer
  • Utilities: Natural Gas Available
  • Water Source: Public

Frequently Asked Questions

How many bedrooms and bathrooms does this single-family home have?

There are 5 bedrooms and 6 bathrooms in this single-family home at 661 Maxwell Avenue.

What schools are nearby to 661 Maxwell Avenue?

Nearby schools include the Whittier E-8 Elementary School, Casey Middle School, and Boulder High School.

What are the annual taxes for 661 Maxwell Avenue?

Annual taxes for this single-family home are estimated at $15,843.

How does 661 Maxwell Avenue compare to other single-family homes in Mapleton Hill?

This single-family home is listed 43% above the average price for single-family homes in Mapleton Hill and has been on the market for 53 less days than the typical home in this area.

What is the square footage on this single-family home?

According to the MLS, this listing is 4,111 sqft.

661 Maxwell Avenue is a 5-bedroom, 6-bath single-family home for sale in Boulder CO 80304. Listed on Prevu for 23 days at $4,975,000. This residence features 4,111 square feet of living space, located in Mapleton Hill. The median listing price for single-family homes in this area is $2,222,750. Nearby schools include Whittier E-8 Elementary School, Casey Middle School, and Boulder High School. Additional amenities include private outdoor space, dishwasher, air conditioning, parking, and washer/dryer. View other single-family home listings in Boulder.

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Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.