National vacancy rates for owner-occupied housing decreased 0.1 percentage points in the first quarter of 2010 to 2.6 percent, according to the Dept. of Commerce’s Census Bureau.  Meanwhile, vacancy rates nationwide for rental housing increased 0.5 percentage points to 10.6 percent during the same period.  The homeownership rate of 67.1 percent was 0.2 percentage points lower than the first quarter 2009 rate of 67.3 percent and 0.1 percentage point lower than the rate last quarter of 67.2 percent, according to the report.