Opportunity knocks! Set on over 12,000 sf of level land in a top commuter location, 181 Summer Street boasts a number of quality upgrades and a strong rental history. A full 2018 3rd-floor dormer added 2 spacious bedrooms and room for a future third full bathroom. Improvements over past 10 years include new roof, two new heating/central air systems, replacement Harvey windows, rebuilt front porch and stairs, and a new tile bathroom (Unit 2). Each unit features hardwood floors and ceramic tile baths. Lower level is partially finished with 2 separate laundry areas and a bonus half bath; new gas water heater 2024 (Unit 1). Property is conveniently located on the Turkey Hill bus line to Alewife, just a few short blocks to vibrant Mass Avenue, public tennis/pickleball courts, AHS and Bishop School, and the popular Minuteman Bikeway. Home also abuts wooded conservation land (Arlington 360). Investors/Contractors/Developers note: Large, deep sunny backyard offers opportunity for expansion.