278 Santo Tomas, Costa Mesa, California 92627, Costa Mesa, 92627 - 4 bed, 3 bath
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278 Santo Tomas
Costa Mesa, California 92627
ACTIVE
CONDITION: POOR
4Beds
3Baths
1,750Sq Ft
7,279Lot Size
Property Price
LIST PRICE$1,775,000
EST. MARKET VALUE
$1,840,054
3% BelowMARKET VALUE
SUMMARY
This property presents a High-Potential Investment Opportunity with a List Price of $1,849,000—positioned well below the $1,894,183 Fair Market Value by 2%. This valuation gap offers $45,183 in Instant Equity. Featuring a 7,279 sq. ft. lot and a newly renovated detached ADU, the asset provides significant Dual Living Potential. With a Condition Rating of 5, the main residence requires a major rehab, making this an ideal acquisition for Buy-and-Hold Investors or Contractors seeking to maximize value in a prime Eastside Costa Mesa location.
Estimated Market Value
$1,840,054+$65,054 Equity Potential
Based on Realkey algorithm analyzing recent comparable sales in Costa Mesa.
Condition Analysis
See Full ReportOVERALL CONDITION SCORE
Poor
TeardownExcellent
Property is extensive renovation needed.
Built in 1958 and sold strictly 'as-is,' the property is heavily marketed as an investment or lot to build a dream home. While there is a newly renovated detached ADU, the main residence shows significant signs of distress and deferred maintenance, including a hazardous exposed ceiling with visible insulation and wiring in the enclosed patio room, requiring a major rehab.
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 = 7279, living area = 1750.
- Dual Living Potential
The property features a main residence plus a newly renovated 800+ sq. ft. detached ADU, offering excellent flexibility for rental income or multi-generational living.
- Prime Eastside Location
Situated on a quiet cul-de-sac in highly desirable Eastside Costa Mesa, providing easy access to Newport Beach, Upper Newport Bay, and top-rated schools.
CONSRISKS & DEFICIENCIES
- MLS Listing Discrepancy
Living area discrepancy between mls listing and other public or private record. mls listing living area = 1750, other record living area = 1168. Bedroom count discrepancy between mls listing and other public or private record. mls listing bedroom count = 4, other record bedroom count = 3.
- As-Is Condition
The property is being sold in its current state with no seller repairs, necessitating additional capital for renovations or potential redevelopment.
- Dated Main Infrastructure
Built in 1958, the main 3-bedroom home includes only 1.5 bathrooms and likely requires significant modernization to meet current market standards.
About 278 Santo Tomas
A rare opportunity awaits in highly desirable Eastside Costa Mesa! Situated on a spacious 7,279-sq-ft lot with generous green space, this versatile property offers immense potential—whether you are creating your dream home, accommodating multi-generational living, or seeking an attractive investment.The property features a 1,160-sq-ft main residence with 3 bedrooms, 1.5 baths, plus a large enclosed patio that provides additional space. Tucked away at the rear of the lot for maximum privacy, the updated approximately 590-sq-ft detached bonus room includes a full bath. Located on a quiet cul-de-sac, you will enjoy quick access to freeways, top-rated schools, Upper Newport Bay Nature Preserve, Newport Beach, Corona del Mar, and PCH. Bring your vision and make this prime Eastside address your own! Sold as-is; seller will make no repairs.
Property Details
Public Facts
- Property Type
- Single Family Residence
- Year Built
- 1958
- Lot Size
- 7,279 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
Costa Mesa Unified Schools
Heinz Kaiser Elementary School
Grades 3-6 • 1.3 mi
8/10
Woodland Elementary School
Grades PK-2 • 1.6 mi
0/10
Mariners Elementary School
Grades PK-6 • 2.3 mi
8/10
Sensitive Facilities
No sensitive facilities data found.
Neighborhood Comparison
| Feature | Subject | Average Home |
|---|---|---|
| Beds | 4.0 | 3.7 |
| Baths | 3.0 | 2.7 |
| Square foot | 1,750 | 1,808.331 |
| Lot Size | 7,279 | 6,450.805 |
| Price | $1.77M | $1.68M |
| Price per sq ft | $1.0K | $962 |
| Built year | 1958 | 1961 |
| HOA | $0 | $302 |
| Days on market | 47 | 51 |
Pricing History
Listed for Sale
Oct 24, 2026
$1,775,000
$1,849,000
-4% Price Drop
Initial Listing
Price Change
Sep 8, 2026
$1,849,000
Initial Listing