Annual increase: 6.5%
Average monthly rent: $1,063
Vacancy rate: 5.3% (6.4% in 2009)
Average concession: -1%
In Boulder—where major employers include the University of Colorado, IBM, and Ball Aerospace—the rental market tightened in 2010, with vacancies falling to 5.3 percent. The area's job market has been stable, with the average unemployment rate at a low 6.4 percent last year, according to BLS preliminary figures. Housing officials have cautioned that a lack of new apartments being developed could result in future scarcity and higher rents, reported Boulder news website dailycamera.com.