3528 Castle Rock Road, Diamond Bar, California 91765, Diamond Bar, 91765 - 4 bed, 2 bath
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3528 Castle Rock Road
Diamond Bar, California 91765
ACTIVE
CONDITION: FAIR
4Beds
2Baths
1,521Sq Ft
7,054Lot Size
Property Price
LIST PRICE$1,150,000
EST. MARKET VALUE
$1,108,821
3% AboveMARKET VALUE
SUMMARY
This Single-Story Residential Asset is a High-Potential Investment Opportunity, listed at $1,180,000—positioned above the $1,103,099 Fair Market Value. While the property requires modernization due to its Fair Condition Rating, it offers significant long-term value through its location in the Walnut Valley Unified School District. The 7,054 sqft corner lot with a private pool provides a strong foundation for value-add renovations. This property is an ideal acquisition for Buy-and-Hold Investors or Owner-Occupants seeking to build equity through strategic cosmetic updates in a premier school district.
Estimated Market Value
$1,108,821
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 |
|---|---|---|---|---|---|---|
★ 3528 Castle Rock Road Subject | $1,150,000* List Price | 4 | 2 | 1,521 | $729 | - |
A 21245 Cold Spring Sold | $875,000 | 3 | 2 | 1,300 | $673 | 0.9 mi |
B 3525 Castle Rock Active | $995,000 List Price | 4 | 2 | 1,521 | $654 | 0.0 mi |
* Subject property listed price vs sold prices of comps.
Condition Analysis
See Full ReportOVERALL CONDITION SCORE
Fair
TeardownExcellent
Property is moderate renovation needed.
Built in 1963, this 61-year-old property is significantly dated. While the interior shows evidence of basic maintenance such as neutral paint and clean carpeting, the exterior stone, windows, and overall architecture remain largely original. The absence of kitchen and bathroom photos in the listing typically indicates these high-value areas have not been recently renovated and likely require modernization. Systems are likely aged, placing this in the 'Fair' category as a functional but dated home needing updates.
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 = 7054, living area = 1521.
- Premier School District
The property is situated within the highly acclaimed Walnut Valley Unified School District, which is a significant driver for long-term property value and highly desirable for families.
- Outdoor Entertainment Space
The home features a private backyard with a sparkling pool on a spacious corner lot, offering a premium outdoor lifestyle that is ideal for entertaining.
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 Infrastructure
Built in 1963, the property may require updates to its original systems or cosmetic modernizations to meet the expectations of contemporary buyers.
- High Price per Square Foot
At a list price of $1.18M for 1,521 square feet, the property commands a premium price point that may be challenging for buyers seeking more interior living space.
About 3528 Castle Rock Road
Welcome to 3528 Castle Rock Road, a charming 4-bedroom, 2-bathroom single-story corner lot home in south Diamond Bar. This inviting residence offers a bright and functional floor plan with comfortable living spaces, a cozy fireplace, and abundant natural light throughout. Step outside to your own private backyard featuring a sparkling pool, perfect for relaxing or entertaining family and friends. Conveniently located near shopping, dining, parks, and major freeways, this home is also within the highly acclaimed Walnut Valley Unified School District.
Property Details
Public Facts
- Property Type
- Single Family Residence
- Year Built
- 1963
- Lot Size
- 7,054 Sq. Ft.
Interior
- Total Bedrooms
- 4
- Total Bathrooms
- 2 (2 Full, 0 Half)
Exterior & Parking
No exterior & parking available.
Utilities & Misc
- HOA Fee
- $0 / Month
Neighborhood Insights
Sensitive Facilities
No sensitive facilities data found.
Neighborhood Comparison
| Feature | Subject | Average Home |
|---|---|---|
| Beds | 4.0 | 4.0 |
| Baths | 2.0 | 3.0 |
| Square foot | 1,521 | 2,280.2 |
| Lot Size | 7,054 | 9,961.367 |
| Price | $1.15M | $1.26M |
| Price per sq ft | $756 | $561 |
| Built year | 1963 | 1978 |
| HOA | $0 | $203 |
| Days on market | 34 | 49 |
Pricing History
Listed for Sale
Aug 19, 2026
$1,150,000
$1,180,000
-3% Price Drop
Initial Listing
Price Change
Aug 6, 2026
$1,180,000
Initial Listing