This may be true nationally, but it is not true in SF.
The number of chronically homeless individuals and families in San Francisco continues to decline. In 2015, 25% of survey respondents were chronically homeless, compared to 31% in 2013. Based on Point-in-Time Count data, it was estimated there were 1,745 chronically homeless individuals and 18 chronically homeless families living in San Francisco on January 29, 2015.