4231 Somerset Ave Castro Valley, CA 94546
MULTI_FAMILY - Castro Valley, CA
Property Features for 4231 Somerset Ave
General Information
- Property type
- Residential Multi Family
- Property subtype
- Other
- Bedrooms
- 3
- Bathrooms
- 1
- Rooms
- Bedroom 1, Laundry Room, Bathroom 1, Bedroom 3, Bedroom 2
- Parking features
- Carport
- Window features
- Double Pane Windows
- Interior features
- Shower Stall(s)
- Exterior features
- Back Yard, Front Yard, Storage, Landscape Front
- Fencing
- Fenced
- Standard status
- Active
- APN
- 84C75732
- Size
- 1,285 SF
- Lot size
- 0.12 Acres
Utilities
- Sewer type
- Public Sewer
- Heating system
- Forced Air, Wall Furnace
- Cooling system
- Central Air
- Water source
- Private
Building Details
- Year built
- 1949
- Number of units
- 2
- Flooring type
- Hardwood, Tile, Carpet, Laminate
- Building materials
- Stucco
- Roof type
- Rolled Hot Mop, Composition
- Additional Structures
- Storage
Listing agent Tim Fiebig License #00657474 (510) 708-8700
Listing office EXP Realty of California, Inc 2603 Camino Ramon Ste 200, San Ramon, CA (888) 584-9427
Listing date Jul 9, 2026
Copyright © 2026 Bay East. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Investment Insights
Based on property information with market context.
The detached ADU is separately fenced for added privacy and is currently rented for $1,750 per month plus utilities. It is described as an updated studio cottage that can provide flexibility as a rental, guest house, private home office, or space for extended family.
This move-in-ready property combines the main home with an on-site detached ADU for two separate living spaces under one ownership.
Key Highlights
- 3‑bedroom, 1‑bath home with 1,035 SF of living space, built in 1949
- Detached 250‑SF cottage/ADU with laundry; currently rented for $1,750/month plus utilities
- Kitchen with Corian countertops, wood cabinetry, 4‑burner gas range, and built‑in microwave
Local Financial Insights For Multifamily LT 5
Simulate Cap Rate and NOI
NOI Build-Up
- Vacancy
- income lost from leasable area expected to sit empty during the year — subtracted from gross rent.
- EGI (Effective Gross Income)
- gross rent minus vacancy losses — the realistic income before paying operating costs.
- OpEx (Operating Expenses)
- recurring costs to operate the property (property tax, insurance, utilities, maintenance, management) — excludes financing and capital improvements.
- NOI (Net Operating Income)
- income a property generates after operating costs but before financing and taxes.
| Component | $ | $/SF |
|---|---|---|
| Gross rent | $65.5k | $51.00 |
| − Vacancy | −$3.9k | −$3.05 |
| EGI | $61.6k | $47.95 |
| − OpEx | −$18.5k | −$14.39 |
| NOI | $43.1k | $33.57 |
