▁ 3 . 8 , ▁ 2 . 8 , ▁and ▁ 2 . 7 ▁percent ▁of ▁those ▁working ▁in ▁the ▁Loop . ▁ ▁The ▁professional ▁sector ▁is ▁the ▁largest ▁source ▁of ▁employ ment ▁of ▁both ▁Loop ▁residents ▁and ▁Loop ▁employees , ▁at ▁respectively ▁ 2 1 . 5 ▁and ▁ 2 4 . 5 ▁percent . ▁Fin ance ▁was ▁the ▁second ▁most ▁common ▁employ ment ▁for ▁both ▁groups , ▁at ▁respectively ▁ 1 3 . 7 ▁and ▁ 1 7 . 9 ▁percent . ▁Education ▁was ▁the ▁third ▁largest ▁sector ▁for ▁both ▁groups , ▁at ▁respectively ▁ 1 0 . 1 ▁and ▁ 1 5 . 6 ▁percent . ▁Health ▁care ▁was ▁the ▁fourth ▁largest ▁employ er ▁of ▁residents ▁at ▁ 1 0 . 1 ▁percent ▁while ▁Public ▁Administration ▁was ▁the ▁fourth ▁largest ▁for ▁employees ▁at ▁ 1 2 . 5 ▁percent . ▁Administration ▁was ▁the ▁fifth ▁largest ▁sector ▁for ▁both ▁groups , ▁at ▁respectively ▁ 6 . 4 ▁and ▁ 7 . 2 ▁percent . ▁ ▁Architecture ▁ ▁The ▁area ▁has ▁long ▁been ▁a ▁hub ▁for ▁architecture . ▁The ▁vast ▁majority ▁of ▁the ▁area ▁was ▁destroyed ▁by ▁the ▁Great ▁Chicago ▁Fire ▁in ▁ 1 8 7 1 ▁but ▁re built ▁quickly . ▁In ▁ 1 8 8 5 ▁the ▁Home ▁In sur ance ▁Building , ▁generally ▁considered ▁the ▁world ' s ▁first ▁sk ys cra per , ▁was ▁constructed , ▁followed ▁by ▁the ▁development ▁of ▁the ▁Chicago ▁school ▁best ▁exempl ified ▁by ▁such ▁buildings ▁as ▁the ▁Ro ok ery ▁Building ▁in