A truly captivating two-unit residence on an expansive 11,400 SF lot within walking distance of downtown San Mateo. Main residence is 1,200 SF Queen Anne Victorian built in 1891, with 2 bedrooms and 1.5 baths, plus an 800 SF unfinished attic. Detached guest house (ADU) built in 2007 is 640 SF 1 bedroom, 1 bath. Main house with historical classification has pristine period detail and character with modern updates. Inviting living room, high ceilings with picture rails, formal dining room, fireplace, and updated kitchen with laundry room. Private landscaped backyard with detached 2 car garage & multiple sitting areas that are perfect for indoor/outdoor living. ADU offers move-in ready full guest quarters with bedroom, living area, open kitchen, full bath, and laundry room. Minutes to downtown San Mateo and downtown Burlingame, with shops, restaurants, parks & more. This is a rare opportunity to own two homes on one lot!