 There were 5,477 housing units at an average density of 581.1 per square mile, of the occupied units 2,680 (52.2%) were owner-occupied and 2,451 (47.8%) were rented.The homeowner vacancy rate was 5.1%; the rental vacancy rate was 4.0%.10,486 people (41.0% of the population) lived in owner-occupied housing units and 9,339 people (36.6%) lived in rental housing units.At the 2000 census there were 21,263 people in 3,971 households, including 3,403 families, in the city.