The most expensive rental in San Francisco costs $30,000 per month and sits on the 40th floor of The Four Seasons hotel

It's no secret that San Francisco real estate is expensive. In the latest example of the market-gone-crazy, the most expensive listing on the market, according to Curbed, is asking a whopping $29,950 a month.

The apartment, which the listing claims is "rarely available for lease," lies on the 40th floor of the Four Seasons hotel on Market Street in the Yerba Buena district of the city.

Zillow has the listing.