The California Department of Finance released its 2013 population estimates for the state and there was strong growth in multi-unit housing last year, both state-wide and in Los Angeles.
"The trend is the same across the state, which gained about 45,000 new housing units, down from 200,000 in peak years but a healthy upswing from previous years. Of those new homes, about 23,801 were multifamily units....
The city of Los Angeles saw 100 percent housing growth in multifamily units..."
http://www.utsandiego.com/news/2013/may/01/demographics-california-san-housing/?page=1#article-copy