The document provides data on unsold and under construction housing units across various Southern California housing markets in 2009. It shows totals for single-family attached (SFA) and single-family detached (SFD) units that were unsold or under construction in the first and second quarters of 2009 broken down by region. It also provides comparisons of unsold inventory levels between 2008 and 2009, showing declines across both SFA and SFD units.