Welcome to 431 & 433 East 19th Street, Costa Mesa - a beautiful single-level duplex nestled in highly sought-after Eastside Costa Mesa. This impeccably maintained duplex offers an exceptional investment opportunity - with the ability to rent it out as-is or add value through additional upgrades. The property also includes a 361 square foot separate structure adjacent to the duplex (not included in the square footage), ideal for conversion into an Accessory Dwelling Unit (ADU) - making the property three units total. Each unit features 2 beds and 1 bath, within a total of 1,520 sqft of living space on an expansive 8,276 square foot lot. Some of the ideal upgrades and features this home includes are dual pane windows, wood and LVP flooring, upgraded kitchen and baths, plantation shutters, vaulted tongue and groove ceilings, and ceiling fans throughout. Privately situated behind a privacy wall, the expansive property enjoys serene surroundings with beautiful landscaping, mature trees, charming courtyards and pathways, decks, and a treehouse. With ample parking, including a detached two-car garage, carport, and driveway, all vehicle needs are easily met. Located within the prestigious Newport Mesa Unified School District and close to the renowned back bay loop for outdoor enthusiasts, as well as 17th St. and Triangle Square for shopping and dining, this property epitomizes the best of Costa Mesa living. Don't miss the opportunity to make this duplex your next investment or house-hacking venture! Call today to schedule a tour!