Nestled in Boulder's coveted Mapleton Hill neighborhood, this delightful legally permitted duplex presents a rare opportunity to live steps from downtown Boulder while generating rental income. Just moments from Pearl Street, Dakota Ridge trailheads, and Mount Sanitas, this property blends historic charm with modern convenience. Relax on the inviting front porch, savoring morning coffee while overlooking the meticulously manicured lawn. The upper unit features an open-concept layout with original hardwood floors, two generously sized bedrooms-one offering a peek at Mount Sanitas-and a beautifully remodeled bathroom. The modern kitchen boasts wood cabinetry and granite countertops. The lower unit, accessible via a private entrance, offers a stylish and functional space with a full kitchen, spacious living area, two bedrooms, and a well-appointed bathroom. Three egress windows flood the space with natural light, creating a bright and welcoming atmosphere. Step outside to the beautifully landscaped backyard, an urban oasis framed by mature trees, ideal for relaxation or entertaining. The property also includes a rare two-car off-street parking pad, a coveted feature in this neighborhood. Whether you're drawn to the vibrant energy of Pearl Street, the serenity of nearby trails, or the income potential of this versatile duplex, 2507 9th St is a one-of-a-kind Boulder gem waiting for you!