Welcome to 421 19th Street - a brand new custom-built residence in Gillette Regent Square, one of the most desirable pockets of Santa Monica's coveted North of Montana neighborhood. Built by the owners for themselves, this exceptional home reflects impeccable attention to detail, intentional design, and an extraordinary level of care throughout. Blending modern luxury with timeless elegance, the home offers seamless indoor-outdoor living - true Southern California living at its finest. Thoughtfully designed for both everyday comfort and elevated entertaining, the open floor plan features two side-by-side living rooms, with a hidden bar and a designer laundry suite discreetly concealed behind stunning walnut paneling. One of the living rooms is further enhanced by floor-to-ceiling folding Jada doors that open directly to the backyard, creating a true indoor-outdoor flow. The chef's kitchen serves as the heart of the home, anchored by a large center island and appointed with a Gaggenau electric and gas cooktop and oven, Sub-Zero refrigerator and freezer, Bosch dishwasher, custom walnut cabinetry, and granite countertops. A sunlit breakfast nook and formal dining room are ideally positioned adjacent to the kitchen, creating a natural flow for gathering and dining. Floor-to-ceiling folding glass doors extend from the dining area to a beautifully landscaped backyard, complete with a sparkling pool and electric cover, as well as inviting outdoor areas for al fresco dining and lounging, surrounded by beautiful, mature trees effortlessly expanding the living space and creating the ultimate setting for entertaining. A guest bedroom suite is conveniently located on the main level. Upstairs, an open lounge/media area, three additional bedrooms, and a bright, light-filled office provide both comfort and flexibility. The stunning primary suite is a true retreat, featuring a spacious walk-in closet and a spa-inspired bathroom with a soaking tub, dual vanities, and a walk-in shower with a skylight and built-in bench. Additional features include solar panels and custom seeded concrete hardscape, including the driveway, walkways, and a thoughtfully designed poolside lounge completing this one-of-a-kind residence in one of Santa Monica's most sought-after neighborhoods.