20843 Chester St, Castro Valley, California 94546, Castro Valley, 94546 - 0 bed, 0 bath
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20843 Chester St
Castro Valley, California 94546
ACTIVE
CONDITION: FAIR
0Beds
0Baths
1,500Sq Ft
11,084Lot Size
Property Price
LIST PRICE$1,298,800
EST. MARKET VALUE
$1,078,830
20% AboveMARKET VALUE
SUMMARY
This Duplex Residential Income property is a High-Potential Investment Opportunity, listed at $1,298,800—positioned above the $1,078,831 Fair Market Value. While currently priced above market, the property features a Condition Rating of 4, reflecting its 1949 vintage. The massive 11,084 square foot lot offers Significant Development Potential with the capacity for five additional ADUs. Located near Top-Rated Schools and BART, this asset provides long-term growth for Buy-and-Hold Investors or Owner-Occupants seeking a multi-generational compound with substantial expansion upside.
Estimated Market Value
$1,078,830
Based on Realkey algorithm analyzing recent comparable sales in Castro Valley.
Comparable Sales Map
Comparables within 1 miles sold in recently
Map unavailable.
| Address | Sold Price | Beds | Baths | Sq Ft | $/Sqft | Distance |
|---|---|---|---|---|---|---|
★ 20843 Chester St Subject 0 bd · 0 ba · 1,500 sqft · $719 | $1,298,800* List Price | 0 | 0 | 1,500 | $719 | - |
A 2632 Renton Way Sold 0 bd · 0 ba · 1,552 sqft · $631 · 0.5 mi | $980,000 | 0 | 0 | 1,552 | $631 | 0.5 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 1949, the property is well-maintained but dated. While it features some modern touches like recessed lighting and updated bathroom vanities, the kitchen contains original or very old knotty pine cabinetry and older appliances. The presence of wall heaters and window AC units indicates older mechanical systems that lack the efficiency of modern central HVAC.
PROSSTRENGTHS & OPPORTUNITIES
- Significant Development Potential
The expansive 11,084 square foot lot offers massive upside, with the potential to add up to five Accessory Dwelling Units (ADUs) according to county planning, providing a rare value-add opportunity.
- Prime Transit-Oriented Location
Boasting a high walkability score, the property is situated within walking distance to BART, public transportation, top-rated schools, and downtown shopping and dining.
- Strategic Investment Versatility
This duplex is ideal for both owner-occupants and investors, with the unique added benefit of a neighboring commercial retail building also being available for purchase to expand a portfolio.
CONSRISKS & DEFICIENCIES
- Aging Infrastructure
Built in 1949, the property may require significant capital improvements or modernization to its core systems and interiors to meet contemporary standards.
- High Entry Price Point
With a list price exceeding $1.4 million for only two existing units, the initial capitalization rate may be low until the additional development potential is fully realized.
About 20843 Chester St
PRICE REDUCED $111,000! Sharp Duplex, quiet downtown location, large lot approximately 11,084 square feet. Tremendous Potential Upside. Per Alameda County Planner this lot can potentially have 5 Accessory Dwelling Units added. Plus commercial retail building next door is also for sale. One unit is two bedrooms 1 bath. The second unit is 1 bedroom 1bath. Approximately 1,590 square feet of living area. Property is nicely landscaped. It has a detached two car garage and storage improvements. It is walking distance to elementary school and high school, many shops, restaurants, BART and Public Transportation. Perfect for OWNER OCCUPIED BUYER, MULTI-GENERATIONAL FAMILIES and/or Investors. Buy and Hold this property could be a great plan! Views: Downtown
Property Details
Public Facts
- Property Type
- Duplex
- Year Built
- 1949
- Lot Size
- 11,084 Sq. Ft.
Interior
- Total Bedrooms
- 0
- Total Bathrooms
- -
Exterior & Parking
No exterior & parking available.
Utilities & Misc
- HOA Fee
- $0 / Month
Neighborhood Insights
Castro Valley Unified Schools
Castro Valley Elementary School
Grades K-5 • 0.2 mi
7/10
Marshall Elementary School
Grades K-5 • 0.8 mi
8/10
Creekside Middle School
Grades 6-8 • 1.1 mi
7/10
Sensitive Facilities
No sensitive facilities data found.
Neighborhood Comparison
| Feature | Subject | Average Home |
|---|---|---|
| Beds | 0.0 | 0.0 |
| Baths | 0.0 | 0.0 |
| Square foot | 1,500 | 2,275.333 |
| Lot Size | 11,084 | 7,797.667 |
| Price | $1.30M | $1.20M |
| Price per sq ft | $866 | $545 |
| Built year | 1949 | 1956 |
| HOA | $0 | $0 |
| Days on market | 91 | 45 |
Pricing History
Listed for Sale
Oct 9, 2026
$1,298,800
$1,409,800
-8% Price Drop
Initial Listing
Price Change
Jul 25, 2026
$1,409,800
Initial Listing