About Harness St
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.
Features of Harness St
| MLS® # | 260019164SD |
|---|---|
| Price | $425,000 |
| Bathrooms | 0.00 |
| Acres | 0.65 |
| Type | Land |
| Status | Active |
Community Information
| Address | Harness St |
|---|---|
| Area | 91977 - Spring Valley |
| Subdivision | Spring Valley |
| City | Spring Valley |
| County | San Diego |
| Zip Code | 91977 |
Amenities
| Is Waterfront | No |
|---|---|
| Has Pool | No |
Interior
| Has Basement | No |
|---|---|
| Fireplace | No |
Additional Information
| Date Listed | August 5th, 2026 |
|---|---|
| Days on Market | 64 |
| Zoning | R1 |
| Foreclosure | No |
| Short Sale | No |
| RE / Bank Owned | No |
Listing Details
| Agent | Dennis Rieder |
|---|---|
| Office | Real Broker |