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For sale
    • Listed by: Samuel G. Castorena Jr • Samuel Castorena • Contact: 626-253-5129
    $1,299,999

    1423 Copper Mountain Dr, Diamond Bar, CA 91765

    4beds
    2,380sqft
    : 
    $8,281/mo
    Get pre-qualified
    Single Family Residence
    Built in 1978
    7,144 Square Feet Lot
    $1,292,400 Zestimate®
    $546/sqft
    $-- HOA

    What's special

    Nestled on a quiet cul-de-sac in the highly desirable city of Diamond Bar, 1423 Copper Mountain offers the perfect blend of modern upgrades, privacy, energy efficiency, and top-rated schools. Located within walking distance to highly acclaimed Quail Summit Elementary and situated in the award-winning Walnut Valley Unified School District, this beautifully maintained home checks all the boxes for today’s buyers. This turnkey property is currently being refreshed with new interior, exterior paint, upgraded PEX plumbing throughout the home complementing the home’s updated kitchen and modern contemporary feel throughout. From the moment you walk in, you’ll notice the pride of ownership and attention to detail that make this home truly move-in ready. Step outside into your own private backyard retreat featuring mature fruit trees, peaceful surroundings, and scenic city light views. Whether you’re entertaining guests, enjoying your morning coffee, or relaxing after a long day, this backyard offers the perfect combination of tranquility and functionality. One of the standout features of this home is the fully paid solar system, helping dramatically reduce electricity costs year-round — a huge benefit for California homeowners looking for energy-efficient living and long-term savings. Outdoor enthusiasts will appreciate the close proximity to local hiking and walking trails, while the nearby Diamond Bar Center offers community events, concerts in the park, weddings, and year-round entertainment just minutes away. Conveniently located near shopping, dining, parks, and easy freeway access, this home combines suburban comfort with everyday convenience. If you’ve been searching for a modern upgraded home in Diamond Bar with views, paid solar, privacy, excellent schools, hiking trails, and a prime cul-de-sac location, this is one you do not want to miss. Walnut Valley Unified School District Quail Summit Elementary Paid solar home Cul-de-sac home City light views Turnkey home Modern upgrades Private backyard Fruit trees Hiking trails nearby Energy-efficient home Move-in ready Diamond Bar real estate Quiet neighborhood Family-friendly neighborhood
    35 days
    |
    979
    |
    46
    |

    Zillow last checked:

    Listing updated:

    Listed by:

    Samuel Castorena DRE #01264865 626-253-5129,

    Samuel G. Castorena Jr

    Source: CRMLS,MLS#: TR26115009MLS LogoOriginating MLS: California Regional MLS

      Facts & features

      Interior

      Bedrooms & bathrooms
      • Bedrooms: 4
      • Bathrooms: 3
      • Full bathrooms: 3
      • Main level bathrooms: 1
      • Main level bedrooms: 1
      Rooms
      • Room types: Family Room, Kitchen, Living Room, Primary Bathroom, Primary Bedroom
      Heating
      • Central
      Cooling
      • Central Air
      Appliances
      • Laundry: Inside
      Features
      • Open Floorplan
      • Has fireplace: Yes
      • Fireplace features: Family Room
      • Common walls with other units/homes: No Common Walls
      Interior area
      • Total interior livable area: 2,380 sqft

      Property

      Parking
      • Total spaces: 2
      • Parking features: Garage - Attached
      • Attached garage spaces: 2
      Features
      • Levels: Two
      • Stories: 2
      • Entry location: 1
      • Pool features: None
      • Has view: Yes
      • View description: City Lights
      Lot
      • Size: 7,144 Square Feet
      • Features: 0-1 Unit/Acre
      Details
      • Parcel number: 8702014042
      • Special conditions: Standard

      Construction

      Type & style
      • Home type: SingleFamily
      • Property subtype: Single Family Residence
      Materials
      • Copper Plumbing
      Condition
      • New construction: No
      • Year built: 1978

      Utilities & green energy

      • Sewer: Public Sewer
      • Water: Public

      Community & HOA

      Community
      • Features: Curbs, Street Lights
      Location
      • Region: Diamond Bar

      Financial & listing details

      • Price per square foot: $546/sqft
      • Tax assessed value: $929,593
      • Annual tax amount: $11,778
      • Date on market: 6/12/2026
      • Cumulative days on market: 35 days
      • Listing terms: Cash to Existing Loan

        Estimated market value

        $1,292,400

        $1.23M - $1.36M

        $4,789/mo

        Price history

        DateEventPrice
        7/22/2026Listed for sale$1,299,999$546/sqft
        Source: CRMLS #TR26115009 Report a problem
        7/14/2026Pending sale$1,299,999$546/sqft
        Source: CRMLS #TR26115009 Report a problem
        7/8/2026Listed for sale$1,299,999$546/sqft
        Source: CRMLS #TR26115009 Report a problem
        6/30/2026Pending sale$1,299,999$546/sqft
        Source: CRMLS #TR26115009 Report a problem
        6/13/2026Listed for sale$1,299,999+52.9%$546/sqft
        Source: CRMLS #TR26115009 Report a problem
        4/10/2020Sold$850,000-2.1%$357/sqft
        Source: CRMLS #TR20042332 Report a problem
        3/13/2020Pending sale$868,000$365/sqft
        Source: Anna Wang Broker #TR20042332 Report a problem
        3/5/2020Price change$868,000-1.4%$365/sqft
        Source: Anna Wang Broker #TR20042332 Report a problem
        3/3/2020Listed for sale$880,000+35.4%$370/sqft
        Source: California Regional MLS #TR20042332 Report a problem
        5/4/2005Sold$650,000$273/sqft
        Source: Public Record Report a problem

        Public tax history

        YearProperty taxesTax assessment
        2025$11,778 +5%$929,593 +2%
        2024$11,219 +2.5%$911,367 +2%
        2023$10,950 +2.1%$893,498 +2%
        2022$10,723 +1.9%$875,980 +2%
        2021$10,524 +2.1%$858,805 +3.7%
        2020$10,310 +2.5%$828,453 +2%
        2019$10,063 +6%$812,210 +2%
        2018$9,497 $796,285 +2%
        2017$9,497 +4.8%$780,672 +2%
        2016$9,059 +3%$765,366 +1.5%
        2015$8,792 -0.7%$753,870 +2%
        2014$8,851 $739,104 +39.9%
        2012-- $528,300
        2011-- $528,300
        2010-- $528,300
        2009-- $528,300 -23.4%
        2008-- $689,783 +2%
        2007-- $676,259 +2%
        2006-- $663,000
        2005-- $663,000 +161.7%
        2004-- $253,343 +1.9%
        2003-- $248,701 +2%
        2002-- $243,826 +4%
        2000-- $234,360
        Find assessor info on the county website

        Monthly payment

        Est. payment

        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: 91765

        Getting around

        65 / 100
        Somewhat Walkable
        30 / 100
        Somewhat Bikeable

        Nearby schools

        GreatSchools rating
        Schools provided by the listing agent
        • Elementary: Quail Summit
        • Middle: Chaparral
        • High: Diamond Bar

        Source: CRMLS. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.

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