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0 Harness St, Spring Valley, CA 91977

Active

Spring Valley

Time on site: 421 days • Last updated: May 1, 2026

Property Type

Land

Property Sub Type

Acres

0.65

Days on Site

193

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.

Property Information

Property Details

Location

Address

0 Harness St

County

San Diego

City

Spring Valley

Zip Code

91977

Subdivision

Spring Valley

MLS Area

91977 - Spring Valley

*Average of $2,150 in rewards is calculated based on the purchase or sale of a home between $400,000 to $449,000. The median home price for all housing types is in the United States is $405,400 as of 2025 as reported by the National Association of Realtors® (NAR). The actual reward amount may vary depending on the purchase or sales price of the home. Please see the Lakeview Home Rewards program terms and conditions for more details. The National Association of Realtors® is a registered trademark of the National Association of Realtors®.

Source: California Regional MLS

IDX information is provided exclusively for personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

For corrections to this data please contact Brytecore MLS Support.

SAND-680683 • SAND-676399

0 Harness St, Spring Valley, CA 91977

Property Information

Property Details

Location

Market Report for 91977