 There were 30,915 housing units, at an average density of 4,050.9 per square mile (1,564.1/km²), of which 11,916 (40.8%) were owner-occupied and 17,301 (59.2%) were occupied by renters.The homeowner vacancy rate was 1.3%; the rental vacancy rate was 5.3%.35,774 people (43.1% of the population) lived in owner-occupied housing units, and 46,701 people (56.2%) lived in rental housing units.