521 Dorchester Road is a stately 6 bedroom, 3.5 bath Spanish-Mediterranean residence located in the heart of the historic San Mateo Park neighborhood, where classic architecture and tree-lined streets define one of the Peninsula's most highly-coveted communities. An inviting foyer welcomes you inside, highlighted by a wrought-iron banister staircase and rich architectural details that immediately set the tone for the home's warmth and sophistication. Upstairs, five generously sized bedrooms provide ample space for family living, including an expansive primary suite with an en-suite bathroom, dual closets, and a versatile office or multi-purpose retreat overlooking the backyard and pool. The main level offers exceptional scale and functionality featuring a gracious living room with wood-burning & gas fireplace surrounded by walls of windows, a sunny library complete with a second fireplace that opens directly to the back patio, a formal dining room and a large kitchen with adjoining eat-in family area designed for both everyday living and hosting. A sixth bedroom with an attached bathroom at the rear of the home offers flexibility for guests, extended family, or an au pair arrangement. A laundry-mudroom adds practicality and opens directly to the backyard. Outside, the grounds provide multiple spaces to relax, entertain, and enjoy California indoor-outdoor living. The in-ground pool is ideal for warm summer days, while mature landscaping and multi-level patio areas create a private and tranquil setting. Additional highlights include a full basement with workbench, abundant storage throughout the home and detached structures, a porte cochere and a spacious front approach with room for multiple vehicles. A vine-covered privacy wall further enhances the home's distinctive curb appeal. Ideally positioned between downtown San Mateo and Burlingame Avenue, residents enjoy convenient access to the Peninsula's premier dining, boutique shopping, cafes, parks, and everyday amenities. Hillsdale Shopping Center, downtown Burlingame, and downtown San Mateo's acclaimed restaurant scene are all nearby, while Caltrain, Highways 101 and 280, and San Francisco International Airport provide easy access throughout the Bay Area. This exceptional home is ready for its next chapter and offers a rare opportunity to own a timeless property in one of San Mateo's most prestigious neighborhoods.