San Francisco is currently in a building boom. Over the next 25 years, there is going to be approximately 92,000 more housing units. The population of San Francisco should reach 1 million by then. Here are some links:

http://www.theatlanticcities.com/jobs-and-economy/2012/12/sa...

http://www.spur.org/publications/library/article/san-francis...

http://sf.streetsblog.org/2013/07/19/plan-bay-area-passes-in...