NOT LISTED FOR SALE

Estimated Value: $4,083,585

5 Beds
4.5 Baths
4,933 Sq Ft
$828/Sq Ft Est. Value

Sale Details

Date Sold: March 31, 2026

Last sale price $4,100,000 $831 Per Sq Ft

Current estimated payment $24,103 / mo

186 Days on Market

Highlights

  • Two Primary Bedrooms
  • 0.43 Acre Lot
  • View of Hills
  • Sub-Zero Refrigerator
  • Open Floorplan
  • Fireplace in Bedroom

About This Home

As of March 2026

Tucked at the end of a quiet cul-de-sac in Boulder's prestigious Flatirons Park neighborhood, 440 Christmas Tree Drive offers a beautifully updated turn-key home with exceptional finishes, privacy, inspiring views of the Flatirons, and convenient proximity to Chautauqua Park and Flagstaff Mountain. Set on a 0.43-acre lot with mature trees, gardens, and a seasonal creek, this home is a rare retreat in one of Boulder's most sought-after enclaves. A flagstone staircase winds through lush landscaping to a covered front porch, where the elevated setting and flat yard introduce the home's inviting character. Inside, hardwood floors, soaring ceilings, and natural light frame elegant interiors. Living spaces flow seamlessly from a welcoming family room with fireplace and custom built-ins to the kitchen and dining room designed for gathering. The kitchen impresses with marble countertops, a French La Cornue stove, Sub-Zero refrigerator, and other premium appliances. A walk-in pantry and buffet counter add everyday convenience, while the dining room, topped by a coffered ceiling and lined with windows, opens directly to the backyard for effortless entertaining. The main level continues with a versatile office or bedroom, a second en-suite bedroom, a hallway bath, and a generous suite with private balcony, dual-vanity bath, and walk-in closet. Upstairs, the primary suite is a sanctuary with vaulted ceilings, gas fireplace, walls of windows framing Flatiron vistas, a spa-like bath, and expansive closet. The lower level is a full height walk-out level with substantial natural light and functional living spaces including a rec room, wine cellar, bedroom and bath, plus two large storage rooms and a utility room with dog wash. Outdoor spaces include a flagstone patio, fenced yard, and grassy area framed by gardens and mature trees. Few settings combine this level of privacy, natural beauty, and proximity to Boulder's best amenities, making this property an extraordinary offering.

Last Agent to Sell the Property

Zachary Zeldner

Compass - Boulder Brokerage Phone: 7204807650 Listed on: 09/23/2025

Compass - Boulder

Last Buyer's Agent

Lindsey Hughes

Compass - Boulder License #100047914

Compass - Boulder
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Home Details

Home Type

  • Single Family

Est. Annual Taxes

  • $18,542

Year Built

  • Built in 1952

Lot Details

  • 18,731 Sq Ft Lot
  • Cul-De-Sac
  • Southern Exposure
  • North Facing Home
  • Wood Fence
  • Landscaped with Trees

Parking

  • 2 Car Attached Garage
  • Garage Door Opener

Home Design

  • Composition Roof
  • Wood Shingle Exterior
  • Stone

Interior Spaces

  • 4,933 Sq Ft Home
  • 2-Story Property
  • Open Floorplan
  • Cathedral Ceiling
  • Multiple Fireplaces
  • Gas Fireplace
  • Window Treatments
  • French Doors
  • Family Room
  • Living Room with Fireplace
  • Dining Room
  • Wood Flooring
  • Views of Hills

Kitchen

  • Eat-In Kitchen
  • Gas Range
  • Microwave
  • Sub-Zero Refrigerator
  • Dishwasher
  • Kitchen Island
  • Disposal

Bedrooms and Bathrooms

  • 5 Bedrooms
  • Main Floor Bedroom
  • Fireplace in Bedroom
  • Double Master Bedroom
  • Walk-In Closet
  • Primary Bathroom is a Full Bathroom
  • Primary bathroom on main floor

Laundry

  • Laundry Room
  • Dryer
  • Washer

Basement

  • Walk-Out Basement
  • Partial Basement
  • Natural lighting in basement

Outdoor Features

  • Balcony
  • Patio

Schools

  • Flatirons Elementary School
  • Manhattan Middle School
  • Boulder High School

Utilities

  • Central Air
  • Baseboard Heating

Community Details

  • No Home Owners Association
  • Flatirons Park Subdivision

Listing and Financial Details

  • Assessor Parcel Number R0008314

Home Details

Home Type

Single Family

Est. Annual Taxes

$18,542

Year Built

Built in 1952

Lot Details

0.43 Acres

Parking

2

Listing Details

  • Year Built: 1952
  • Property Sub Type: Single Family Residence
  • Prop. Type: Residential
  • Lot Size Acres: 0.43
  • Co List Office Mls Id: IRECBR02
  • Subdivision Name: Flatirons Park
  • Unit Levels: Two
  • New Construction: No
  • Efficiency: Southern Exposure
  • Property Attached Yn: No
  • Attribution Contact: 7204807650
  • RoomType: Bedroom 4
  • RoomType: Bedroom 5
  • RoomType: Dining Room
  • RoomType: Family Room
  • RoomType: Kitchen
  • RoomType: Laundry
  • IRE_HasWaterRights: No
  • IRE_TotalSqFt: 4933
  • IRE_NewConstructionStatus: Not New, Previously Owned
  • RoomType: Living Room
  • RoomFeatures: Full Primary Bath, Luxury Features Primary Bath, 5 Piece Primary Bath
  • RoomType: Primary Bedroom
  • IRE_HasFamilyRoom: 1
  • Special Features: VirtualTour

Interior Features

  • Possible Use: Single Family
  • Appliances: Gas Range, Dishwasher, Refrigerator, Washer, Dryer, Microwave, Disposal
  • Accessibility Features: Main Floor Bath, Main Level Bedroom
  • Has Basement: Partial, Partially Finished, Walk-Out Access, Daylight
  • Full Bathrooms: 1
  • Half Bathrooms: 1
  • Three Quarter Bathrooms: 3
  • Total Bedrooms: 5
  • Door Features: French Doors
  • Fireplace Features: Two or More, Gas, Living Room, Bedroom
  • Flooring: Wood
  • Interior Amenities: Eat-in Kitchen, Separate Dining Room, Cathedral Ceiling(s), Open Floorplan, Pantry, Walk-In Closet(s), Kitchen Island, Two Primary Suites, High Ceilings
  • Window Features: Window Coverings

Exterior Features

  • Roof: Composition
  • Fencing: Fenced, Wood
  • Lot Features: Cul-De-Sac, Evergreen Trees, Deciduous Trees, House Faces North
  • View: Hills
  • Waterfront: No
  • Disclosures: Seller's Property Disclosure, Lead Paint
  • Construction Type: Frame, Stone, Wood Shingle
  • Exterior Features: Balcony
  • Patio And Porch Features: Patio

Garage/Parking

  • Garage Spaces: 2
  • Parking Features: Garage Door Opener, Attached
  • IRE_GarageType: Attached

Utilities

  • Cooling: Central Air
  • Electric: XCEL
  • Heating: Baseboard
  • Utilities: Natural Gas Available, Electricity Available
  • Sewer: Public Sewer
  • Water Source: City

Condo/Co-op/Association

  • Association: No

Schools

  • Elementary School: Flatirons
  • HighSchool: Boulder
  • Junior High Dist: Boulder Valley Dist RE2
  • Middle Or Junior School: Manhattan

Lot Info

  • Zoning: SFR
  • Parcel #: R0008314
  • Irrigation Water Rights: No

Tax Info

  • Tax Year: 2024
  • Tax Annual Amount: 18542

Ownership History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Name Owned For Owner Type

Purchase Details

Listed on
Sep 23, 2025
Closed on
Mar 31, 2026
Sold by
Bought by
Seller's Agent
Zachary Zeldner
Compass - Boulder
Buyer's Agent
Lindsey Hughes
Compass - Boulder
List Price
$4,750,000
Sold Price
$4,100,000
Premium/Discount to List
-$650,000
-13.68%
Views
112
Current Estimated Value
$4,083,585

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Estimated Appreciation
-$16,415
Avg. Annual Appreciation
-1.17%

Purchase Details

Closed on
Jul 25, 2002
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$796,600
Interest Rate
6.69%

Purchase Details

Closed on
Nov 21, 1994
Sold by
Bought by

Purchase Details

Closed on
Nov 17, 1993
Sold by
Bought by

Purchase Details

Closed on
Apr 14, 1983
Bought by
Source: Public Records

Home Values in the Area

Source: Public Records

Average Home Value in this Area





Source: Public Records

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Purchase History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Buyer Sale Price Title Company
$4,100,000 Fidelity National Title Compan
$1,138,000 First Colorado Title
$516,500 --
$495,000 Commonwealth Land Title Ins
$95,000 --
Source: Public Records

Mortgage History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Status Borrower Loan Amount
Previous Owner $796,600
Source: Public Records

Property History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Event Price List to Sale Price per Sq Ft Prior Sale
03/31/2026 03/31/26 Sold $4,100,000 -13.7% $831 / Sq Ft
09/25/2025 09/25/25 For Sale $4,750,000 +128.9% $963 / Sq Ft
05/10/2021 05/10/21 Off Market $2,075,000 -- --
09/06/2016 09/06/16 Sold $2,075,000 -11.7% $421 / Sq Ft View Prior Sale
08/08/2016 08/08/16 Pending -- -- --
05/19/2016 05/19/16 For Sale $2,349,000 -- $476 / Sq Ft
Source: IRES MLS

Tax History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

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
2026 $19,383 $221,170 $160,915 $60,255
2025 $19,383 $221,170 $160,915 $60,255
2024 $18,542 $203,281 $147,900 $55,381
2023 $18,220 $210,983 $151,634 $63,034
2022 $16,372 $176,301 $127,901 $48,400
2021 $15,612 $181,374 $131,581 $49,793
2020 $14,210 $163,249 $125,340 $37,909
2019 $13,993 $163,249 $125,340 $37,909
2018 $15,502 $178,805 $78,624 $100,181
2017 $15,017 $197,678 $86,923 $110,755
2016 $13,140 $151,797 $60,735 $91,062
2015 $12,443 $132,837 $72,277 $60,560
2014 $11,169 $132,837 $72,277 $60,560
Source: Public Records

Agents Affiliated with this Home

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Map

Source: IRES MLS

MLS Number: IRE1044245

IRES MLS

APN: 1461364-33-006

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