Vacancy for rental housing units in the Denver metro area increased to 3.8% for the 2nd quarter of 2010, according to a report conducted by the Colorado Division of Housing. Of the counties used for the measure, Boulder/Broomfield boasted the highest average rent ($1,518.43) and the highest vacancy rate (8.6%), while Denver posted the lowest rental rate ($962.91) and Douglas and Arapahoe both posted the lowest measures for vacancy at 2.9%. The average monthly rental rate of $1,027.78 for the period is a decline of $7.78 from the 1st quarter measure and an increase of $11.43 in the 2nd quarter of 2009.