Nestled atop storied Nob Hill and directly across from the landmark Mark Hopkins Hotel, 843 Mason Street is a rare architectural treasure. Designed in 1917 by the legendary Willis Polk, this home is part of an exclusive row of classic townhouses that embody the timeless sophistication of early 20th-century San Francisco. This stunning 5BD/4BA/2HB residence spans approximately 4,427 square feet (per Open Homes floor plan) and unfolds across four thoughtfully designed levels, offering a rare combination of versatility, scale, and timeless charm. A private urban home that feels both impressive in scale and peaceful in character. One of only a handful of homes in this historically significant enclave, it presents a rare opportunity to own a lasting piece of San Francisco's architectural legacy. Surrounded by iconic landmarksGrace Cathedral, Huntington Park, the Fairmontand just steps from world-class dining and cable cars, with Union Square, the Financial District, and Russian Hill close by. Leased parking is conveniently available nearby at the Crocker Garage. This is more than a homeit's a timeless piece of San Francisco's architectural heritage, designed by a master and located in one of the city's most celebrated settings.