"Architects, envision a set of twin villas with a classic design on a 20-meter frontage lot in an urban area of Muscat, Oman, featuring a sidewalk and an asphalt road with cars. Design each villa with three floors, embracing timeless and elegant architectural elements that define a classic style. Despite the classic design, integrate sustainable practices by utilizing energy-efficient systems and materials. Explore innovative space utilization strategies for each floor to ensure functionality and privacy. Pay careful attention to the interaction of the classic twin villas with the sidewalk and road. Enhance the design with landscaping elements that complement the classic aesthetics and create a connection with the urban environment. Utilize 3D visualization to showcase the classic and sustainable features, offering a glimpse into the distinctive and sophisticated living experience these three-story twin villas provide in the context of Muscat's urban landscape."