 There were 7,885 housing units at an average density of 3,440.9/sq mi (1,329.4/km²).There were 3,783 households out of which 9.9% had children under the age of 18 living with them, 54.9% were married couples living together, 3.7% had a female householder with no husband present, and 39.9% were non-families.Of all households 33.9% were made up of individuals and 17.9% had someone living alone who was 65 years of age or older.