▁ 1 1 ▁were ▁built ▁before ▁ 1 9 1 9 , ▁while ▁ 3 8 ▁were ▁built ▁between ▁ 1 9 9 0 ▁and ▁ 2 0 0 0 . ▁ ▁The ▁greatest ▁number ▁of ▁single ▁family ▁homes ▁( 1 1 1 ) ▁were ▁built ▁between ▁ 1 9 1 9 ▁and ▁ 1 9 4 5 . ▁▁ ▁there ▁were ▁ 4 , 4 9 8 ▁apart ments ▁in ▁the ▁municipality . ▁ ▁The ▁most ▁common ▁a partment ▁size ▁was ▁ 3 ▁rooms ▁of ▁which ▁there ▁were ▁ 1 , 6 9 2 . ▁ ▁There ▁were ▁ 3 1 6 ▁single ▁room ▁apart ments ▁and ▁ 4 9 3 ▁apart ments ▁with ▁five ▁or ▁more ▁rooms . ▁ ▁Of ▁these ▁apart ments , ▁a ▁total ▁of ▁ 3 , 7 6 3 ▁apart ments ▁( 8 3 . 7 % ▁of ▁the ▁total ) ▁were ▁perman ently ▁occupied , ▁while ▁ 1 8 1 ▁apart ments ▁( 4 . 0 %) ▁were ▁season ally ▁occupied ▁and ▁ 5 5 4 ▁apart ments ▁( 1 2 . 3 %) ▁were ▁empty . ▁ ▁The ▁vac ancy ▁rate ▁for ▁the ▁municipality , ▁, ▁was ▁ 3 . 5 %. ▁ ▁, ▁the ▁construction ▁rate ▁of ▁new ▁housing ▁units ▁was ▁ 2 . 4 ▁new ▁units ▁per ▁ 1 0 0 0 ▁residents . ▁▁ ▁the ▁average ▁price ▁to ▁rent ▁an ▁average ▁a partment ▁in ▁Chi asso ▁was ▁ 8 7 3 . 8 9 ▁Swiss ▁fran cs ▁( CH F ) ▁per