400 N Mountain Ave
Upland, CA 91786
Stewart Plaza · Office/Medical Property For Lease · 12,232 SF

Stewart Plaza offers a prime office and medical environment in the heart of Upland, CA. This professionally managed property features elevator service, abundant parking, and flexible suite sizes ranging from compact executive offices to expansive medical layouts. Tenants benefit from proximity to major transportation corridors, including the 10 and 210 Freeways, ensuring seamless regional connectivity. The surrounding area is rich with retail amenities, creating a convenient and vibrant setting for employees and clients alike. Medical professionals will appreciate suites designed with exam rooms, labs, and nurse stations, while traditional office users can select spaces with reception areas, private offices, and collaborative bullpens. Executive suites are also available for businesses seeking a turnkey solution. The property’s strategic location near Montclair, Ontario, and Claremont positions tenants within a dynamic Inland Empire market known for strong demographics and growth potential.