Fully remodeled half-duplex with a light-filled open floor plan and upgraded finishes throughout. In addition to full cosmetic overhaul, other improvements include new windows, roof, electrical, and mechanical systems. Enjoy mountain views from multiple rooms and a spacious deck off the primary bedroom. The private yard backs directly to open space and the Boulder County trail system.
A full unfinished basement with bathroom plumbing rough-in offers excellent potential for expansion. Attached covered two-car carport. Small quiet neighborhood, LOW HOA, unincorporated Boulder County with low property taxes and just a quick 10-minute commute to anything in central Boulder.
For sale
Price cut: $15K (4/23)
$499,999
4645 Portside Way, Boulder, CO 80301
2beds
1,536sqft
Duplex
Built in 1980
1,942 Square Feet Lot
$487,500 Zestimate®
$326/sqft
$123/mo HOA
What's special
Attached covered two-car carportLight-filled open floor planUpgraded finishes throughoutNew windows
- 76 days |
- 1,063 |
- 39 |
Zillow last checked:
Listing updated:
Listed by:
Marina Jensen 303-908-9117,
Posh Realty
Source: REcolorado as distributed by MLS GRID,MLS#: 6750570
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Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 2
- Bathrooms: 2
- Full bathrooms: 1
- 1/4 bathrooms: 1
- Main level bathrooms: 1
Bedroom
- Description: Generous Size With Deck Access
- Features: Primary Suite
- Level: Upper
Bedroom
- Description: Second Bedroom Upstairs, Features Mountain Views
- Level: Upper
Bathroom
- Description: Full Remodel
- Level: Main
Bathroom
- Description: Full Remodel
- Level: Upper
Dining room
- Description: Open To Kitchen, With Access To The Side Yard
- Level: Main
Kitchen
- Description: Full Remodel, Open To Dining Room
- Level: Main
Living room
- Description: Light Filled With All New Flooring
- Level: Main
Heating
- Forced Air
Cooling
- None
Appliances
- Included: Convection Oven, Dishwasher, Disposal, Microwave, Oven, Range, Refrigerator, Self Cleaning Oven
- Laundry: In Unit
Features
- Ceiling Fan(s), Eat-in Kitchen, Smart Thermostat, Smoke Free, Stone Counters
- Basement: Full,Unfinished
- Common walls with other units/homes: 1 Common Wall
Interior area
- Total structure area: 1,536
- Total interior livable area: 1,536 sqft
- Finished area above ground: 1,024
- Finished area below ground: 0
Property
Parking
- Total spaces: 2
- Parking features: Carport
- Carport spaces: 2
Features
- Levels: Two
- Stories: 2
- Patio & porch: Patio
- Exterior features: Balcony, Private Yard
- Fencing: Partial
- Has view: Yes
- View description: Mountain(s)
Lot
- Size: 1,942 Square Feet
- Features: Greenbelt, Open Space
Details
- Parcel number: R0083999
- Zoning: SR
- Special conditions: Standard
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Contemporary
- Property subtype: Duplex
- Attached to another structure: Yes
Materials
- Frame, Wood Siding
- Foundation: Slab
- Roof: Composition
Condition
- Updated/Remodeled
- Year built: 1980
Utilities & green energy
- Sewer: Public Sewer
- Water: Public
Community & HOA
Community
- Security: Carbon Monoxide Detector(s), Smoke Detector(s)
- Subdivision: Portal Estates
HOA
- Has HOA: Yes
- Services included: Maintenance Grounds, Snow Removal, Trash
- HOA fee: $391 annually
- HOA name: Twin Lakes HOA
- HOA phone: 303-457-1444
- Second HOA fee: $90 monthly
- Second HOA name: Portal Estates
- Second HOA phone: 983-207-5231
Location
- Region: Boulder
Financial & listing details
- Price per square foot: $326/sqft
- Tax assessed value: $398,500
- Annual tax amount: $2,525
- Date on market: 4/13/2026
- Listing terms: 1031 Exchange,Cash,Conventional,FHA,VA Loan
- Exclusions: None
- Ownership: Corporation/Trust
Estimated market value
$487,500
$463,000 - $512,000
$3,083/mo
Price history
| Date | Event | Price |
|---|---|---|
| 4/23/2026 | Price change | $499,999-2.9%$326/sqft |
Source:  REcolorado as distributed by MLS GRID #6750570 Report a problem | ||
| 4/13/2026 | Listed for sale | $515,000+114.6%$335/sqft |
Source: REcolorado as distributed by MLS GRID #6750570 Report a problem | ||
| 1/10/2022 | Listing removed | -- |
Source: Zillow Rental Manager Report a problem | ||
| 1/3/2022 | Listed for rent | $1,375$1/sqft |
Source: Zillow Rental Manager Report a problem | ||
| 12/3/2020 | Listing removed | $1,375$1/sqft |
Source: Zillow Rental Manager Report a problem | ||
| 11/30/2020 | Listed for rent | $1,375$1/sqft |
Source: Zillow Rental Manager Report a problem | ||
| 7/25/2020 | Listing removed | $1,375$1/sqft |
Source: Zillow Rental Manager Report a problem | ||
| 7/23/2020 | Listed for rent | $1,375$1/sqft |
Source: Zillow Rental Manager Report a problem | ||
| 7/2/2020 | Sold | $240,000$156/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $2,150 +1.7% | $24,906 -6.7% |
| 2024 | $2,115 -14.2% | $26,700 -12.4% |
| 2023 | $2,464 +4.8% | $30,463 +21.5% |
| 2022 | $2,350 +0.5% | $25,069 -2.8% |
| 2021 | $2,339 | $25,790 +1.6% |
| 2020 | $2,339 +13.8% | $25,390 |
| 2019 | $2,055 | $25,390 +13.4% |
| 2018 | $2,055 | $22,385 -9.5% |
| 2017 | $2,055 +31.2% | $24,748 +45.6% |
| 2016 | $1,566 +5.2% | $16,995 +8.2% |
| 2015 | $1,488 -2.2% | $15,705 |
| 2014 | $1,522 +6.7% | $15,705 |
| 2013 | $1,426 +1.1% | $15,705 -6% |
| 2012 | $1,411 +2.4% | $16,716 |
| 2011 | $1,377 +5.8% | -- |
| 2010 | $1,303 +6.5% | $16,520 |
| 2009 | $1,223 +2.5% | $16,520 -9.7% |
| 2008 | $1,193 +2% | $18,300 |
| 2007 | $1,170 +8.5% | $18,300 +4.5% |
| 2006 | $1,078 +10.3% | $17,520 |
| 2005 | $978 +0.5% | $17,520 +15.9% |
| 2004 | $973 -2.6% | $15,120 |
| 2003 | $999 +9% | $15,120 +11.7% |
| 2002 | $916 | $13,540 -90.9% |
| 2001 | -- | $148,000 |
Find assessor info on the county website
Monthly payment
Est. payment$--/mo
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
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Climate risks
Neighborhood: Gunbarrel
Nearby schools
GreatSchools rating
- 7/10Heatherwood Elementary SchoolGrades: PK-5Distance: 1.5 mi
- 6/10Nevin Platt Middle SchoolGrades: 6-8Distance: 3.9 mi
- 10/10Boulder High SchoolGrades: 9-12Distance: 5.1 mi
Schools provided by the listing agent
- Elementary: Heatherwood
- Middle: Platt
- High: Boulder
- District: Boulder Valley RE 2
Source: REcolorado 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.
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A local lender can help you make sure your offer is ready when you are.
- Colorado
- Boulder County
- Boulder
- 80301
- Gunbarrel
- 4645 Portside Way
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