1423 Copper Mountain, Diamond Bar, CA 91765
Single-family home
Sold September 2026
Listing Agent: Samuel Castorena (DRE #01264865) · Listing Office: Samuel G. Castorena Jr · Contact: 626-253-5129 · Bought with: Baoke Wang · Real Brokerage Technologies, Inc · MLS #TR26115009 · Source: CRMLS
How this sale compares
1423 Copper Mountain sold for $1,218,888 in September 2026, 2.5% under its $1,249,888 list price, after 58 days on the market. It was first listed at $1,299,999. That works out to $512 per square foot on 2,380 square feet. Across 196 closed sales in 91765 over the last 12 months, the median sold price is $1,084,000 and the median is $553 per square foot, 8.0% above this sale's $512. 4-bedroom rentals in 91765 currently list at a median of $4,475 a month (16 listings).
| Quarter | Closed sales in 91765 | Median sold price |
|---|---|---|
| Q1 2026 | 16 | $1,050,000 |
| Q2 2026 | 87 | $1,128,000 |
| Q3 2026 | 89 | $1,057,000 |
| Q4 2026 | 4 | $798,000 |
Figures are MLS-reported closed sales (CRMLS); ZIP medians cover the last 12 months. Nalren does not estimate values. Recently sold in Diamond Bar · Homes for sale in 91765
Description
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
Listing description from the September 2026 sale, as reported to CRMLS.
Sale history
Recent sales near 1423 Copper Mountain
1566 Autumn Hill: Sold $1,640,000 · 5 bd · 3 ba · 2,842 sqft · Sep 2026 · 0.1 mi
Keller Williams Realty | DRE #01913277
Buyer's agent: Michael Chang, Keller Williams Realty | DRE #019132771350 S Diamond Bar Boulevard A: Sold $516,000 · 2 bd · 1 ba · 814 sqft · Sep 2026 · 0.2 mi
Doubletree Realtors | DRE #01181503
Buyer's agent: Luis Hsu, Meridian Capital Real Estate | DRE #018614261338 S Diamond Bar Boulevard C: Sold $550,000 · 2 bd · 2 ba · 1,079 sqft · Aug 2026 · 0.2 mi
THE ASSOCIATES REALTY GROUP | DRE #01478157
Buyer's agent: Hengjie Jiao, Harvest Realty Development | DRE #021119641590 Deer Crossing Drive: Sold $1,450,000 · 5 bd · 3 ba · 2,806 sqft · Sep 2026 · 0.3 mi
RE/MAX Premier Properties | DRE #01133034
Buyer's agent: TRACIE WONG, Real Brokerage Technologies | DRE #0205359823819 Country View: Sold $1,130,000 · 4 bd · 2 ba · 1,704 sqft · Sep 2026 · 0.3 mi
Coldwell Banker Tri-Counties R | DRE #01016494
Buyer's agent: Thomas Higgins, Redfin Corporation | DRE #014567451543 S Diamond Bar Boulevard 20: Sold $650,000 · 3 bd · 3 ba · 1,391 sqft · Sep 2026 · 0.4 mi
CENTURY 21 MASTERS | DRE #00632854
Buyer's agent: HSIEN TSAI, Pinnacle Real Estate Group | DRE #0103252323025 Paseo De Terrado 5: Sold $825,600 · 3 bd · 3 ba · 1,641 sqft · Aug 2026 · 0.4 mi
Marketing Specialists | DRE #01213587
Buyer's agent: Amy Ji, ReMax 2000 Realty | DRE #017436161303 Holly Leaf Way: Sold $1,388,000 · 5 bd · 3 ba · 2,447 sqft · Aug 2026 · 0.4 mi
Exp Realty of California Inc | DRE #01859720
Buyer's agent: Linchen Yang, FIRST TEAM REAL ESTATE | DRE #01889710
Closed sales reported in 91765, nearest first, last 12 months. All recent sales in Diamond Bar →