Nestled on a tranquil, tree-lined street in the coveted “Oak Knoll” area of San Marino, this gracious Mediterranean-style residence has been meticulously maintained and thoughtfully renovated and expanded by the current owners. It offers a harmonious blend of timeless sophistication and modern comfort. The manicured front yard, adorned with boxwood hedges and pink impatiens, along with concrete steps with intricate flagstone inlays, welcomes one to the handsome wooden front door. The elegant wood flooring flows seamlessly throughout the home and defines the refined interior. The entryway, featuring graceful archways, leads one to the public rooms. To the right, the magnificent living room is anchored by a fireplace with a French limestone mantel and adorned by two gorgeous leaded windows that provide views of the front garden. The adjoining spacious family room boasts parefeuilles tile flooring, built-in bookshelves, and French doors opening to an expansive covered patio. Adjacent to the family room is the impressive formal dining room, showcasing a striking chandelier. The modern, open kitchen is equipped with top-of-the-line stainless steel appliances, a breakfast bar, an eat-in area, and a built-in desk/workspace. The laundry room and powder room are conveniently located off the kitchen. A bedroom suite with a ¾ bathroom to the left of the entry is an ideal home office or guest quarter. A stairway illuminated by a skylight and an exquisite pendant light leads to the second floor. The grand primary suite features a separate sitting area and a private balcony offering serene views of the lush backyard, perfect for morning coffee or an evening nightcap. The spa-inspired bathroom includes double vanities, a large soaking tub, and an oversized shower, along with dual, deep closets. There are three additional bedrooms, each with custom shutters and custom built-in closets. A centrally located ¾ hallway bathroom with classic peacock green tiles and a frameless shower door completes the second floor. The large finished basement provides additional storage space or can be an ideal wine cellar. Step outside through the rear French doors to the covered patio next to the outdoor built-in BBQ island and beautifully landscaped backyard; the tall hedges create a private and peaceful backdrop for any size outdoor gatherings and everyday rejuvenation. A flagstone walkway, adorned with vibrant roses, leads to the charming guest house behind the garage featuring a tiled ¾ bath, perfect as a spa retreat! The vast verdant yard offers potential for a pool or paddle court, even expansion of the guest house as an ADU - the possibilities are endless. An extra-long driveway with an automatic gate leads to the two-car finished garage. This extraordinary residence is a true gem, tailored for the most discerning new owner to cherish for many years to come.