This 3+1+1 configured living room sofa set delivers a coordinated, formal lounge aesthetic defined by intentional visual contrast and structured, symmetrical design. The set includes one three-seat sofa and two matching single armchairs, unified by sleek black upholstery paired with warm brown polished solid wood armrests and low block feet. Precise contrast stitching outlines soft, wide, curved arm frames, creating a polished, tailored look that anchors open layout spaces. Each piece sits on a low, stable base, with proportional dimensions that support balanced symmetric arrangement without overwhelming surrounding decor. Built for long-term stationary use, the set features a kiln-dried solid hardwood and multilayer plywood inner frame treated for insect and corrosion resistance. Polished glossy solid wood forms the armrests and block feet, finished with clear lacquer to highlight natural wood grain. Contact upholstery surfaces use either black top-grain leather or wear-resistant PU faux leather, finished with a stain-resistant coating. Seat cushions are filled with high-resilience polyurethane foam, with an optional pocketed coil core for enhanced support, while back and arm padding uses softer polyurethane foam wrapped in polyester fiber batting for smooth, soft edges. The seat suspension system combines rust-proof treated high-manganese steel sinuous springs with high-tension elastic webbing, paired with differentiated foam densities for seat and back to balance support and comfort. As a fixed, non-reclining seating set with no moving recline mechanisms, it offers straightforward, low-maintenance function. The stain and moisture resistant upholstery allows routine care via simple wipe-down with a soft damp cloth, while wide solid wood arm frames and low block feet distribute weight evenly for stable, tip-resistant stationary placement. This set is well suited for both residential and commercial spaces, including formal open-plan residential living rooms as primary seating for family and guests, and professional settings such as executive office reception areas and formal waiting rooms. For procurement, buyers should note the set ships across two cartons, with a reference assembly time of 40 minutes per set. Upholstery type (top-grain leather or PU faux leather) and seat cushion core configuration (standard foam or pocketed coil upgrade) are selectable at order placement, allowing alignment with specific budget and use case requirements. Each seat supports a static weight capacity aligned with standard commercial and residential seating needs, with per-piece assembled weights suitable for stable, fixed placement rather than frequent repositioning.