1809 Diamond Knoll, Diamond Bar, California 91765, Diamond Bar, 91765 - 6 bed, 5 bath
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1809 Diamond Knoll
Diamond Bar, California 91765
ACTIVE
CONDITION: EXCELLENT
6Beds
5Baths
5,797Sq Ft
45,189Lot Size
Property Price
LIST PRICE$4,000,000
EST. MARKET VALUE
$4,106,248
SUMMARY
This Stunning Diamond Bar Estate is a Prime Investment Opportunity, listed at $4,000,000—positioned well below the $4,106,248 Fair Market Value by 2%. This valuation gap offers $106,248 in Instant Equity. Featuring a gourmet kitchen, resort-style pool and spa, and an Excellent Condition Rating, this home provides a turnkey lifestyle in the elite Walnut Valley Unified School District. With panoramic views and a detached guest house, it is an ideal acquisition for Luxury Homebuyers or Owner-Occupants seeking a prestigious, high-utility sanctuary.
Estimated Market Value
$4,106,248
Based on Realkey algorithm analyzing recent comparable sales in Diamond Bar.
Comparable Sales Map
Comparables within 1 miles sold in recently
Map unavailable.
| Address | Sold Price | Beds | Baths | Sq Ft | $/Sqft | Distance |
|---|---|---|---|---|---|---|
★ 1809 Diamond Knoll Subject 6 bd · 5 ba · 5,797 sqft · $708 | $4,000,000* List Price | 6 | 5 | 5,797 | $708 | - |
A 1822 Diamond Knoll Lane Active 6 bd · 7 ba · 6,726 sqft · $593 · 0.1 mi | $3,990,000 List Price | 6 | 7 | 6,726 | $593 | 0.1 mi |
* Subject property listed price vs sold prices of comps.
Condition Analysis
See Full ReportOVERALL CONDITION SCORE
Excellent
TeardownExcellent
Property is new construction or fully renovated.
Although built in 1992, the property has undergone high-end renovations featuring a gourmet kitchen with quartz countertops, glass tile backsplash, and stainless-steel appliances. The interior is described as immaculate with modern hardwood floors and luxury finishes, placing it in the category of a recent renovation (<5 years) in mint condition.
PROSSTRENGTHS & OPPORTUNITIES
- High Available Lot Utilization
The property has a large lot size, which is more than 4 times of its living area. lot size in square feet = 45189, living area = 5797.
- Great Schools
Elementary School: Quail Summit Elementary School (9/10). High School: Diamond Bar High School (10/10).
- Resort-Style Outdoor Living
The expansive one-acre lot features a luxurious backyard oasis with a pool, waterfall grotto, spa, built-in BBQ, and a detached guest house and gym, offering unparalleled entertainment value.
CONSRISKS & DEFICIENCIES
- MLS Listing Discrepancy
Bedroom count discrepancy between mls listing and other public or private record. mls listing bedroom count = 6, other record bedroom count = 5.
- Substantial Maintenance Overhead
The sheer scale of the 5,797-square-foot residence combined with extensive water features and a guest house implies high monthly utility and landscaping maintenance costs.
- Premium Pricing
At a $4 million list price, the property sits at the top of the local market, which may limit the pool of qualified buyers and extend the time on market compared to more moderately priced luxury homes.
About 1809 Diamond Knoll
STUNNING DIAMOND BAR ESTATE WITH PANORAMIC VIEWS! Welcome to luxury living in an exclusive gated community in the prestigious Diamond Bar Hills. This immaculate estate offers breathtaking mountain views, soaring vaulted ceilings, beautiful hardwood floors, and an open, light filled floor plan. The gourmet kitchen features quartz countertops, oversized island, stainless-steel appliances, and a stunning glass tile backsplash. The spacious primary suite offers panoramic views and a private wrap-around balcony. Step into your own resort style backyard with a sparkling pool & spa, waterfall grotto, hot tub, built-in BBQ, and gazebo perfect for entertaining or relaxing. A guest house and private gym add even more versatility. Located near premier golf, dining, fitness, and highly acclaimed Walnut Valley Unified schools. Privacy. Luxury. Views. Resort-style living. This exceptional Diamond Bar estate is one you won’t want to miss!
Property Details
Public Facts
- Property Type
- Single Family Residence
- Year Built
- 1992
- Lot Size
- 45,189 Sq. Ft.
Interior
- Total Bedrooms
- 6
- Total Bathrooms
- 5 (5 Full, 0 Half)
Exterior & Parking
No exterior & parking available.
Utilities & Misc
- HOA Fee
- $308.0 / Month
Neighborhood Insights
Diamond Bar Unified Schools
Quail Summit Elementary School
Grades K-5 • 0.4 mi
9/10
Evergreen Elementary School
Grades K-5 • 1.9 mi
8/10
Castle Rock Elementary School
Grades K-5 • 2.6 mi
7/10
Sensitive Facilities
No sensitive facilities data found.
Neighborhood Comparison
| Feature | Subject | Average Home |
|---|---|---|
| Beds | 6.0 | 4.0 |
| Baths | 5.0 | 3.0 |
| Square foot | 5,797 | 2,325.519 |
| Lot Size | 45,189 | 10,258.123 |
| Price | $4.00M | $1.27M |
| Price per sq ft | $690 | $559 |
| Built year | 1992 | 1978 |
| HOA | $308.0 | $207 |
| Days on market | 18 | 56 |
Pricing History
Listed for Sale
Oct 6, 2026
$4,000,000
Initial Listing
Sold
Feb 23, 2022
$3,500,000
Public Record
Sold
Oct 21, 2011
$2,680,000
Public Record
Sold
Oct 15, 2008
$2,000,000
Public Record
Sold
Feb 27, 2001
$1,600,000
Public Record