▁are ▁mainly ▁profession als ▁such ▁as ▁dent ists , ▁medical ▁do ctors , ▁att or ne ys , ▁and ▁ins urance ▁agents . ▁ ▁Architecture ▁The ▁First ▁National ▁Bank ▁Building ▁is ▁the ▁third ▁building ▁on ▁the ▁same ▁site ▁for ▁the ▁bank . ▁It ▁replaced ▁a ▁building ▁that ▁was ▁destroyed ▁by ▁a ▁fire . ▁The ▁building ▁was ▁designed ▁by ▁Chicago ▁architect s ▁Frank ▁A . ▁Child s ▁and ▁William ▁Jones ▁Smith ▁in ▁the ▁Renaissance ▁Rev ival ▁style . ▁It ▁r ises ▁ ▁above ▁the ▁ground ▁and ▁includes ▁nine ▁flo ors ▁with ▁a ▁steel ▁frame ▁and ▁brick ▁construction . ▁The ▁structure ▁is ▁built ▁on ▁a ▁concrete ▁foundation ▁and ▁is ▁faced ▁with ▁stone . ▁Its ▁form ▁is ▁rest rained , ▁but ▁the ▁decor ation ▁on ▁the ▁lower ▁level ▁of ▁the ▁building ▁is ▁not . ▁The ▁sty list ic ▁details ▁e voke ▁the ▁Renaissance ▁Rev ival ▁style ▁and ▁comb ines ▁classical ▁preced ents ▁with ▁forms ▁that ▁are ▁associated ▁with ▁the ▁six teenth ▁century ▁Italian ▁Renaissance . ▁These ▁sty list ic ▁elements ▁are ▁combined ▁with ▁the ▁techn ological ▁adv ances ▁of ▁the ▁Chicago ▁School . ▁ ▁The ▁building ▁can ▁be ▁divided ▁into ▁three ▁sections : ▁a ▁two - story ▁base ; ▁five ▁flo ors ▁of ▁offices ; ▁and ▁a ▁two - story ▁section ▁at ▁the ▁top ▁that ▁termin ates ▁in ▁a ▁bra cket ed ▁cor nice . ▁The ▁lower ▁level ▁of ▁the ▁building ▁is ▁a ▁tall ▁ar cade ▁of ▁round ▁arch es ▁and ▁pil aster s ▁with ▁detailed ▁capit als . ▁The ▁capit als ▁feature ▁car v ings