what are the best hotels to stay in san francisco?
W San Francisco Hostelling International, City Center Palace Hotel, San Francisco Clift
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 A popular tourist destination , San Francisco is known for its cool summers , fog , steep rolling hills , eclectic mix of architecture , and landmarks , including the Golden Gate Bridge , cable cars , the former Alcatraz Federal Penitentiary , Fisherman 's Wharf , and its Chinatown district . San Francisco is also the headquarters of five major banking institutions and various other companies such as Levi Strauss & Co . , Gap Inc . , Salesforce.com , Dropbox , Reddit , Square , Inc . , Dolby , Airbnb , Weebly , Pacific Gas and Electric Company , Yelp , Pinterest , Twitter , Uber , Lyft , Mozilla , Wikimedia Foundation , and Craigslist . It has several nicknames , including " The City by the Bay " , " Fog City " , " San Fran " , and " Frisco " , as well as older ones like " The City that Knows How " , " Baghdad by the Bay " , " The Paris of the West " , or simply " The City " . As of 2015 , San Francisco was ranked high on world livability rankings . 

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 Since the 1990s , the demand for skilled information technology workers from local startups and nearby Silicon Valley has attracted white @-@ collar workers from all over the world and created a high standard of living in San Francisco . Many neighborhoods that were once blue @-@ collar , middle , and lower class have been gentrifying , as many of the city 's traditional business and industrial districts have experienced a renaissance driven by the redevelopment of the Embarcadero , including the neighborhoods South Beach and Mission Bay . The city 's property values and household income have risen to among the highest in the nation , creating a large and upscale restaurant , retail , and entertainment scene . According to a 2014 quality of life survey of global cities , San Francisco has the highest quality of living of any U.S. city . However , due to the exceptionally high cost of living , many of the city 's middle and lower @-@ class families have been leaving the city for the outer suburbs of the Bay Area , or for California 's Central Valley . By June 2 , 2015 , the median rent was reported to be as high as $ 4 @,@ 225 . The high cost of living is due in part to restrictive planning laws which limit new residential construction . 

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 Because of its status as a symbol of high society and luxury , the hotel has featured in many notable works of fiction . 

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 Several of San Francisco 's parks and nearly all of its beaches form part of the regional Golden Gate National Recreation Area , one of the most visited units of the National Park system in the United States with over 13 million visitors a year . Among the GGNRA 's attractions within the city are Ocean Beach , which runs along the Pacific Ocean shoreline and is frequented by a vibrant surfing community , and Baker Beach , which is located in a cove west of the Golden Gate and part of the Presidio , a former military base . Also within the Presidio is Crissy Field , a former airfield that was restored to its natural salt marsh ecosystem . The GGNRA also administers Fort Funston , Lands End , Fort Mason , and Alcatraz . The National Park Service separately administers the San Francisco Maritime National Historical Park – a fleet of historic ships and waterfront property around Aquatic Park . 

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 The city is also a landing point on three fiber optic cable systems linking the United States across the Pacific Ocean : C2C , Southern Cross Cable , and VSNL Transpacific . These cable landings , lower energy costs , and tax breaks led to a boom of data centers being built starting about 2010 . Data centers include those for Adobe , NetApp , Umpqua Bank , OHSU , and Fortune Data Centers . 
