142 144 6th Street, Seal Beach, California 90740

An extraordinary opportunity to own a rare double-lot duplex in one of Southern California’s most sought-after coastal communities. Opportunities like this seldom become available in the heart of coveted Old Town Seal Beach’s prestigious Gold Coast neighborhood. Whether you’re looking to build your dream home, complete a 1031 exchange, live in one unit while generating rental income from the other, or capitalize on a unique investment or development opportunity, this property offers exceptional flexibility in one of California’s most beloved beach towns. Located just one block from the sand and ocean, this exceptional double lot presents endless possibilities for homeowners, investors, and developers alike. Potential opportunities include dividing the property into two separate lots and constructing new homes with ADUs, retaining one existing structure while developing the second lot, or preserving the charming one-bedroom beach cottage and adding an ADU above the garage (all subject to City approval). The property features two original beach cottages connected by a shared courtyard. Unit 144 is a spacious 3, 047-square-foot residence (per appraisal) offering 3 bedrooms and 3.5 bathrooms. The main level features a generous family room, kitchen, dining area, living room, bedroom, a full bathroom and a half bathroom . Upstairs, you’ll find a large den, an expansive primary suite with a walk-in closet and en-suite bathroom, as well as a secondary bedroom and an additional full bathroom. A spiral staircase leads to the rooftop deck, where breathtaking 360-degree views of the coastal town, city lights, and surrounding mountains create an unforgettable setting. Unit 142 is a charming 1-bedroom, 1-bathroom beach cottage complete with a living room, kitchen, and private outdoor yard. Each residence includes its own spacious two-car garage with access from a wide alley—an uncommon and highly desirable feature in Old Town. This is a standout opportunity for owner-users, investors, and developers seeking a premier coastal property with exceptional versatility and long-term potential. Just moments from the beach, the boutique shops and restaurants of Main Street, and highly rated school district, this rare double-lot property offers the very best of Seal Beach coastal living.