21504 Cold Spring, Diamond Bar, California 91765, Diamond Bar, 91765 - 4 bed, 3 bath
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21504 Cold Spring
Diamond Bar, California 91765
ACTIVE UNDER CONTRACT
CONDITION: GOOD
4Beds
3Baths
2,712Sq Ft
14,248Lot Size
Property Price
LIST PRICE$1,460,000
EST. MARKET VALUE
$1,460,000
SUMMARY
This Stunning Hillside Residence is a Strong Value Opportunity, listed at $1,580,000—positioned well below the $1,693,111 Fair Market Value by 6%. This valuation gap offers $113,111 in Instant Equity. Featuring a Good Condition Rating, the home includes Paid-off Solar, Tesla EV Charging, and a Private Pool with panoramic views. Located in the elite Walnut Valley Unified School District, this property is an ideal acquisition for Buy-and-Hold Investors or Owner-Occupants seeking a premium, energy-efficient lifestyle.
Estimated Market Value
$1,460,000
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 |
|---|---|---|---|---|---|---|
★ 21504 Cold Spring Subject | $1,460,000* List Price | 4 | 3 | 2,712 | $538 | - |
A 3249 Hawkwood Road Sold | $1,505,000 | 4 | 3 | 2,712 | $555 | 0.2 mi |
B 21535 Chirping Sparrow Sold | $1,680,000 | 4 | 3 | 2,697 | $623 | 0.2 mi |
C 3595 Hawkwood Sold | $1,315,000 | 4 | 3 | 2,336 | $563 | 0.3 mi |
D 3396 Hawkwood Sold | $1,250,000 | 4 | 3 | 2,380 | $525 | 0.2 mi |
E 3357 Bent Twig Sold | $1,330,000 | 5 | 4 | 2,037 | $653 | 0.1 mi |
F 21465 Running Branch Sold | $1,180,000 | 3 | 2 | 1,752 | $674 | 0.1 mi |
G 3607 Hawkwood Sold | $1,768,000 | 5 | 4 | 3,030 | $583 | 0.3 mi |
H 3106 Cherrydale Pending | $1,340,000 List Price | 4 | 3 | 2,640 | $508 | 0.2 mi |
* Subject property listed price vs sold prices of comps.
Condition Analysis
See Full ReportOVERALL CONDITION SCORE
Good
TeardownExcellent
Property is move-in ready.
While built in 1977, the property is well-maintained and move-in ready with significant system upgrades including a newer roof, newer A/C, paid-off solar, and EV charging stations. The kitchen features a functional renovation (approx. 5-15 years old) with stone countertops and stainless appliances, fitting the 'Good' criteria for age of renovation and maintenance level.
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 = 14248, living area = 2712.
- Great Schools
High School: Diamond Bar High School (10/10).
- Elite School District
The property is situated within the prestigious Walnut Valley Unified School District, providing access to top-rated 10/10 schools, which significantly bolsters long-term resale value.
CONSRISKS & DEFICIENCIES
- MLS Listing Discrepancy
Bedroom count discrepancy between mls listing and other public or private record. mls listing bedroom count = 4, other record bedroom count = 3.
- Vintage Interior Elements
Built in 1977, the home may require additional capital investment for cosmetic interior updates to kitchens and bathrooms to meet modern luxury expectations.
- Premium Pricing
At a list price of $1.58M, the property is positioned at the higher end of the local market, which may narrow the pool of competitive buyers in the current interest rate environment.
About 21504 Cold Spring
PAID OFF Solar System with 32 Panasonic Panels. Two Tesla EV charging stations, 2025 AO Smith electric water heater, a whole-house water softener system, newer roof, and newer A/C. Enjoy beautiful mountain views by day and sparkling city lights by night from this lovely home nestled in the desirable hills of Diamond Bar, complete with a private pool perfect for relaxing or entertaining. The bright and airy layout features soaring high ceilings in the living room, abundant natural light, a desirable downstairs bedroom, and a spacious 3-car garage. Located within the award-winning Walnut Valley Unified School District with top-rated 10/10 schools, and just minutes from Diamond Hills Plaza featuring H Mart, popular dining, shopping, and everyday conveniences. NO HOA.
Property Details
Public Facts
- Property Type
- Single Family Residence
- Year Built
- 1977
- Lot Size
- 14,248 Sq. Ft.
Interior
- Total Bedrooms
- 4
- Total Bathrooms
- 3 (3 Full, 0 Half)
Exterior & Parking
No exterior & parking available.
Utilities & Misc
- HOA Fee
- $0 / Month
Neighborhood Insights
Diamond Bar Unified Schools
Castle Rock Elementary School
Grades K-5 • 0.4 mi
7/10
South Pointe Middle School
Grades 6-8 • 1.7 mi
8/10
Diamond Bar High School
Grades 9-12 • 1.2 mi
10/10
Sensitive Facilities
No sensitive facilities data found.
Neighborhood Comparison
| Feature | Subject | Average Home |
|---|---|---|
| Beds | 4.0 | 4.0 |
| Baths | 3.0 | 3.0 |
| Square foot | 2,712 | 2,280.2 |
| Lot Size | 14,248 | 9,961.367 |
| Price | $1.46M | $1.26M |
| Price per sq ft | $538 | $561 |
| Built year | 1977 | 1978 |
| HOA | $0 | $203 |
| Days on market | 102 | 49 |
Pricing History
Listed for Sale
Aug 22, 2026
$1,460,000
$1,540,000
-5% Price Drop
Initial Listing
Price Change
Jul 29, 2026
$1,540,000
$1,580,000
-3% Price Drop
Initial Listing
Price Change
May 30, 2026
$1,580,000
Initial Listing
Sold
Jan 20, 2012
$700,000
Public Record
Sold
Sep 26, 1995
$294,500
Public Record