▁allow ▁business es ▁more ▁time ▁to ▁acc lim ate ▁to ▁their ▁new ▁addresses . ▁ ▁Several ▁streets ▁in ▁the ▁Loop ▁have ▁multiple ▁levels , ▁some ▁as ▁many ▁as ▁three . ▁The ▁most ▁prominent ▁of ▁these ▁is ▁W acker ▁Drive , ▁which ▁faces ▁the ▁Chicago ▁River ▁throughout ▁the ▁area . ▁Illinois ▁Center ▁neighborhood ▁has ▁three - level ▁streets . ▁ ▁The ▁eastern ▁termin us ▁of ▁U . ▁S . ▁Route ▁ 6 6 , ▁an ▁icon ic ▁highway ▁in ▁the ▁United ▁States ▁first ▁chart ed ▁in ▁ 1 9 2 6 , ▁was ▁located ▁at ▁Jackson ▁Bou lev ard ▁and ▁Michigan ▁Avenue . ▁When ▁Illinois ▁and ▁Missouri ▁agreed ▁that ▁the ▁local ▁sign age ▁for ▁Route ▁ 6 6 ▁should ▁be ▁replaced ▁with ▁that ▁of ▁Inter state ▁ 5 5 ▁as ▁the ▁route ▁was ▁pre domin ately ▁north - s outh ▁in ▁those ▁states , ▁most ▁signs ▁of ▁the ▁former ▁highway ▁in ▁Chicago ▁were ▁removed ▁without ▁incident ▁but ▁the ▁final ▁sign ▁on ▁the ▁corner ▁of ▁Jackson ▁and ▁Michigan ▁was ▁removed ▁with ▁great ▁fan fare ▁on ▁January ▁ 1 3 , ▁ 1 9 7 7 , ▁and ▁replaced ▁with ▁a ▁sign ▁reading ▁" END ▁OF ▁R OUT E ▁ 6 6 ". ▁ ▁The ▁La ▁S alle ▁Hotel ' s ▁par king ▁gar age ▁was ▁the ▁first ▁high - r ise ▁par king ▁gar age ▁in ▁the ▁Loop , ▁constructed ▁in ▁ 1 9 1 7 ▁at ▁the ▁corner ▁of ▁Washington ▁and ▁La S alle ▁Stre ets ▁and ▁remaining ▁in ▁service ▁until ▁its ▁demol ition