According to SanFranog.com, San Francisco is a world leader in expensive hotel parking. The Westin Saint Francis (at Union Sqare) is a notable example, charging $63 a day (not counting tips to the valet).
This is not a class of hotel I generally stay in. If you want to know how the top San Francisco luxury hotels match up, California Travel Experiences is ranking them for value, service, location, reputation, and “frequent stays.” The seven hotels under consideration are Four Seasons, Ritz Carlton, Mandarin Oriental, Saint Regis, Palace Hotel,Intercontinental Mark Hopkins, and W San Francisco. They’ll announce a winner later on.