# Harness St #0, Spring Valley, CA 91977 > **TL;DR:** land, $425,000. Est. $2,273/mo. Listed 89 days. ## Property at a Glance | Attribute | Value | |-----------|-------| | Price | $425,000 | | Lot Size | 28,314 sqft (0.65 acres) | | Property Type | Land (Other) | | Status | Active | | Days on Market | 89 | ## Estimated Monthly Costs | Category | Amount | |----------|--------| | Principal & Interest (20% down, 30-year at 6.5%) | $2,149 | | Estimated Insurance | $124 | | **Total** | **$2,273** | ## Property Highlights - 0.65 acre lot ## Description ### Agent Description Rare double-lot opportunity in Spring Valley. Two contiguous parcels sold together -- APNs 578-102-14-00 and 578-102-15-00 -- combining to create a highly flexible development site in one of San Diego County's most in-demand inland corridors. Under current 2026 California law, this site supports significant density. Build two single-family residences (up to approximately 3,000 sqft each), with ADU and Junior ADU potential on each lot per California's expanded ADU statutes. SB-9 lot-split and duplex provisions may unlock additional units, subject to County of San Diego zoning verification. Whether you are a builder looking for your next project, an investor positioning for long-term hold, or an end-user who wants to build custom and keep a second lot -- this is the kind of opportunity that rarely comes packaged this cleanly. No demo. No teardown. Just raw land, ready to go. Buyer to verify all zoning, permitted uses, utility availability, and development potential with County of San Diego prior to close. ## Location - **Address:** Harness St #0, Spring Valley, CA 91977 - **County:** San Diego - **Neighborhood:** SPRING VALLEY - **Coordinates:** 32.72119749, -117.0137031 - **Google Maps:** https://www.google.com/maps?q=32.72119749,-117.0137031 ## Virtual Tour & Media - **Video Tour:** https://www.propertypanorama.com/instaview/snd/260019164 ## Listing Agent - **Name:** Dennis B Rieder · **License:** 02014241 - **Brokerage:** Real Broker - **Broker Phone:** (619) 248-6434 - **Listing URL:** [View original listing](https://www.realtor.com/realestateandhomes-detail/Harness-St_La-Mesa_CA_91977_M23937-32528?f=listhub&s=SANDICOR&m=260019164&c=propsimple) ## Photos ![Harness St #0 - Photo 1](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f2600349068r.jpg) ![Harness St #0 - Photo 2](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f2725015371r.jpg) ![Harness St #0 - Photo 3](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f1871443125r.jpg) ![Harness St #0 - Photo 4](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f1798605664r.jpg) ![Harness St #0 - Photo 5](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f4143322523r.jpg) ![Harness St #0 - Photo 6](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f3651048515r.jpg) ![Harness St #0 - Photo 7](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f2586387615r.jpg) ![Harness St #0 - Photo 8](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f2859406039r.jpg) ![Harness St #0 - Photo 9](http://lh.rdcpix.com/2ad0a62254298ffff28757a01237c0a8l-f2250639751r.jpg) --- **MLS#:** 260019164 | **Updated:** 2026-10-31 **Source:** listhub *Copyright © 2026 San Diego MLS. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.* [View on PropertySimple](https://staging.propertysimple.ai/listing/harness-st-spring-valley-ca-91977-0f3d43f93ff34601933b1b693455c689) --- ## Structured Data ```json { "@context": "https://schema.org", "@type": "RealEstateListing", "@id": "https://staging.propertysimple.ai/listing/harness-st-spring-valley-ca-91977-0f3d43f93ff34601933b1b693455c689#listing", "url": "https://staging.propertysimple.ai/listing/harness-st-spring-valley-ca-91977-0f3d43f93ff34601933b1b693455c689", "name": "Harness St #0, Spring Valley, CA 91977", "description": "Rare double-lot opportunity in Spring Valley. Two contiguous parcels sold together -- APNs 578-102-14-00 and 578-102-15-00 -- combining to create a highly flexible development site in one of San Diego County's most in-demand inland corridors. 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