Rare double-lot development opportunity in Spring Valley — APNs 578-102-14-00 and 578-102-15-00 sold together. Two contiguous parcels create a flexible canvas for builders, investors, and end-users navigating today's California housing landscape. Under current 2026 state law, the development potential is significant: build two single-family residences (up to ~3,000 sqft each), plus the potential for ADUs and Junior ADUs on each lot per California's expanded ADU statutes. SB-9 lot-split and duplex provisions may further unlock additional units, subject to County of San Diego zoning and verification.
Lot/land
$425,000
0 Harness St #0, Spring Valley, CA 91977
0beds
0baths
0.65Acres
Unimproved Land
Built in ----
0.65 Acres Lot
$-- Zestimate®
$--/sqft
$-- HOA
What's special
Two contiguous parcelsRare double-lot
- 15 hours |
- 30 |
- 1 |
Zillow last checked:
Listing updated:
Listed by:
Dennis B Rieder DRE #02014241 Preferred:858-232-2929,
Real Broker
Source: SDMLS,MLS#: 260019164
Originating MLS: SDMLS
Originating MLS: SDMLSFacts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 0
- Bathrooms: 0
Interior area
- Total structure area: 0
Property
Features
- Fencing: N/K
- Frontage type: Open Space,Other/Remarks
Lot
- Size: 0.65 Acres
Details
- Parcel number: 5781021400
- Zoning: R1
- Zoning description: R1
Utilities & green energy
- Water: N/K
- Utilities for property: N/K
Community & HOA
Community
- Subdivision: SPRING VALLEY
Location
- Region: Spring Valley
Financial & listing details
- Date on market: 8/5/2026
- Listing terms: Cal Vet,Cash,Conventional,FHA,VA
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 5/1/2026 | Price change | $425,000-5.6% |
Source:  SDMLS #250027245 Report a problem | ||
| 4/28/2026 | Listed for sale | $450,000 |
Source: SDMLS #250027245 Report a problem | ||
| 9/12/2025 | Listing removed | $450,000 |
Source: SDMLS #250027245 Report a problem | ||
| 5/12/2025 | Listed for sale | $450,000 |
Source: SDMLS #250027245 Report a problem | ||
Public tax history
Tax history is unavailable.
Monthly payment
Climate risks
Neighborhood: 91977
Nearby schools
GreatSchools rating
- 4/10Avondale Elementary SchoolGrades: K-5Distance: 0.3 mi
- 6/10Science, Technology, Engineering, Arts, And Math Academy At La PresaGrades: 5-8Distance: 0.8 mi
- 4/10Mount Miguel High SchoolGrades: 9-12Distance: 0.2 mi
- $42,900-- bd-- ba-- sqftGowin St, Spring valley, CA 91977Off Market
- $633,9002 bd1 ba992 sqft8601 Harness St, Spring Valley, CA 91977Off Market
- $732,5003 bd2 ba1k sqft8602 Eileen St, Spring Valley, CA 91977Off Market
- $784,9003 bd2 ba1.7k sqft8608 Eileen St, Spring Valley, CA 91977Off Market
- $606,2003 bd1 ba992 sqft8607 Harness St, Spring Valley, CA 91977Off Market
- $95,285-- bd-- ba-- sqftHarness St, Spring valley, CA 91977Off Market
- $696,6003 bd2 ba1k sqft8614 Eileen St, Spring Valley, CA 91977Off Market
- $694,3003 bd2 ba1k sqft1503 Gowin St, Spring Valley, CA 91977Off Market
A local agent can set up tours, give advice and negotiate with sellers.
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