1873 Diamond Street presents a rare owner-user and investment opportunity within the highly sought-after La Costa Meadows industrial submarket of San Marcos. The 20,000-square-foot freestanding industrial building is configured as a multi-tenant asset, allowing buyers to immediately benefit from existing income while maintaining future occupancy flexibility. Approximately 12,000 square feet is scheduled to become available on October 1, 2026, while approximately 8,000 square feet remains leased to an existing tenant, creating a unique combination of occupancy potential and in-place cash flow. The property features a highly functional industrial design with both dock-high and grade-level loading, heavy power capacity, fenced parking and yard areas, and a flexible warehouse-to-office layout suitable for manufacturing, distribution, logistics, assembly, and related industrial operations. The ability to occupy a majority portion of the building while retaining rental income from the remaining space may appeal to owner-users seeking financing flexibility and operational control. Strategically located in North San Diego County, the property benefits from convenient access to Highway 78, Interstate 5, and Interstate 15, providing connectivity throughout Southern California. The surrounding industrial corridor is home to a diverse concentration of manufacturing, technology, distribution, and service-oriented businesses. Proximity to McClellan-Palomar Airport, Carlsbad, Encinitas, Rancho Santa Fe, and other affluent coastal communities further enhances the property's accessibility and business appeal. The combination of near-term occupancy, established tenant income, flexible multi-tenant configuration, and location within one of San Diego County's most established industrial markets positions the asset for both owner-user and investment strategies.