Commercial Opportunity in the Heart of Downtown Waltham! Positioned on busy Main Street, this versatile ±3,890 sq ft commercial building offers outstanding visibility for an owner-user or investor. The recently renovated two-story space features an open floor plan with expansive storefront windows, abundant natural light, multiple private offices or treatment rooms, updated ADA-compliant restroom, rear service area, and separate rear access. The flexible layout is well suited for retail, office, medical, wellness, showroom, creative, or professional uses. Available for sale or lease (NNN), this legal conforming commercial property provides exceptional exposure in one of Waltham's most active business districts. Surrounded by established businesses, restaurants, shops, public transportation, and major commuter routes, this is a rare opportunity to establish or expand your business in a thriving downtown location.