# Harness St #0, Spring Valley, CA 91977

> **TL;DR:** land, $425,000. Est. $2,273/mo. Listed 56 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 | 56 |

## 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 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.

## 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

## Listing Agent

- **Name:** Dennis B Rieder · **License:** 02014241
- **Brokerage:** Real Broker
- **Phone:** 8582322929
- **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:** 2026-09-29
**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://www.propertysimple.ai/listing/harness-st-spring-valley-ca-91977-60019164)

---

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