A truly one-of-a-kind opportunity in the heart of Downtown Belleville! This remarkable mixed-use property seamlessly blends commercial functionality with an exceptionally well-preserved 1970s architectural masterpiece. Whether you're looking for a live/work environment, investment property, boutique office, creative studio, or a space with endless redevelopment potential, this building offers possibilities that are nearly impossible to duplicate. The main level features professional commercial office space with outstanding street presence, while the lower level provides abundant storage, a two-car garage, and a unique dumbwaiter designed to transport groceries and other items directly to the second-floor living quarters. Above it all is an extraordinary private residence that feels like stepping back into the golden age of modern design. The second floor offers 3 bedrooms, 2 bathrooms, dramatic open living spaces, an iconic floating staircase, a private spiral staircase, and countless original architectural details that have been beautifully preserved. Every room celebrates the bold design elements that made 1970s contemporary architecture so distinctive. One of the home's most captivating features is the expansive private courtyard and patio overlooking Downtown Belleville. Whether enjoying your morning coffee, entertaining guests, or taking in an evening concert from the city below, the panoramic views create an unforgettable setting unlike anything else in the area. From its timeless architecture and unique design features to its unmatched flexibility and downtown location, this is more than just a property -it's a landmark waiting for its next chapter. Properties of this caliber and character rarely become available. Schedule your private tour and experience this architectural gem for yourself. (58 spaces for public parking are located directly across Mascoutah Ave)