From Calculated Risk.
In 2011, residential investment will make a positive contribution to the economy for the first time since 2005. The five years of drag on GDP from RI (2006 through 2010) is the longest period on record, breaking the previous record of four years from 1930 to 1933 (yeah, the Great Depression). The positive contribution this year will mostly be due to a pickup in multifamily construction (apartments) and in home improvement. However single family housing starts will continue to struggle.
Like a lot of Arizona real estate, home construction is terrible but improving.