The JW Marriott San Francisco Union Square Hotel takes center stage in the cultural heart of the city, with an architecturally stunning style all its own. Inspire your imagination at a wide array of nearby galleries, museums, restaurants and boutiques or simply retreat to the comfort of our Union Square hotel's spacious guest rooms offering 55-inch Smart Technology TVs with connectivity to all wireless devices. We're located at 515 Mason Street, San Francisco, CA 94102, at the corner of Post and Mason Street. We're close to tap rooms, pugs, and curry shops. We're in between I-101 and I-80, and are a few streets over from the nearby Powell Street BART station. Experience the style, elegance and unmatched energy of the JW Marriott San Francisco Union Square Hotel. Discover our state-of-the-art fitness center or indulge in the culinary creations showcased at our stylish Level Three Bar and lounge. In addition to our 13,320 square feet of state-of-the-art San Francisco conference center space, we offer dedicated event managers, exceptional catering, and a luxurious venue for corporate events.