▁in ▁ 2 0 0 5 . ▁In ▁the ▁ 1 9 2 0 s ▁old ▁buildings ▁were ▁purchased ▁in ▁the ▁area ▁and ▁converted ▁to ▁par king ▁structures . ▁More ▁high - r ise ▁gar ages ▁and ▁par king ▁lots ▁were ▁constructed ▁in ▁the ▁ 1 9 3 0 s , ▁which ▁also ▁saw ▁the ▁advent ▁of ▁double - deck ▁par king . ▁The ▁first ▁par king ▁meters ▁were ▁installed ▁in ▁ 1 9 4 7 ▁and ▁private ▁gar ages ▁were ▁reg ulated ▁in ▁ 1 9 5 7 ; ▁they ▁were ▁b anned ▁out right ▁in ▁the ▁Loop ▁in ▁the ▁ 1 9 7 0 s ▁in ▁response ▁to ▁federal ▁air - quality ▁standards . ▁The ▁first ▁under ground ▁gar ages ▁were ▁built ▁by ▁the ▁city ▁in ▁early ▁ 1 9 5 0 s . ▁ ▁The ▁pl ur ality ▁of ▁households ▁in ▁the ▁Loop , ▁at ▁ 4 8 . 8 ▁percent , ▁have ▁one ▁vehicle ▁available , ▁compared ▁to ▁a ▁city wide ▁figure ▁of ▁ 3 5 . 8 ▁percent . ▁ 4 1 . 9 ▁percent ▁of ▁households ▁have ▁no ▁vehicles ▁available , ▁compared ▁to ▁ 1 2 . 7 ▁percent ▁city wide . ▁The ▁pl ur ality ▁of ▁residents ▁in ▁the ▁work force , ▁at ▁ 4 3 . 3 ▁percent , ▁walk ▁or ▁bi ke ▁to ▁work ▁compared ▁to ▁ 8 . 8 ▁percent ▁city wide . ▁Trans it ▁is ▁the ▁second ▁most ▁popular ▁form ▁of ▁comm ute , ▁at ▁ 2 6 . 1 ▁percent ▁of