Endless Potential & Unbeatable Versatility in Rainier Heights! Welcome home to 1840 W 11th Ave, a fantastic property nestled in the desirable Rainier Heights neighborhood of Kennewick. Sitting on a generous quarter-acre lot (10,280 sq ft), this classic 1972-built gem offers over 2,000 square feet of total space, perfectly blending comfortable living with incredible future potential. Step inside to a bright and inviting main floor that boasts a functional, single-story layout with plenty of natural light. With up to 5 bedrooms and 2 full bathrooms across both levels, there is abundant space for hosting guests or setting up the ultimate home office. The Standout Feature: Head downstairs to discover a massive, 1,030 sq. ft. basement that expands your living space exponentially. The basement now features all-new exterior access! This private, separate entrance opens up a world of possibilities—making it the absolute perfect setup for a mother-in-law suite, a private guest quarter, a potential income-generating ADU, or an easily accessible home gym and entertainment hub. 2,060 total square feet (1,030 sq ft main level + 1,030 sq ft basement). A spacious 0.24-acre lot with plenty of room for summer barbecues, gardening, or letting pets roam. An attached two-car garage provides secure parking and extra room for your tools and toys .Tucked away in a quiet neighborhood, yet just minutes from local schools.