▁S ull ivan , ▁un related ▁to ▁Wright ' s ▁previous ▁employ er ▁Louis ▁S ull ivan , ▁had ▁worked ▁in ▁Wright ' s ▁Oak ▁Park ▁Studio ▁before ▁leaving ▁for ▁Ott awa ▁in ▁ 1 9 0 8 ▁to ▁work ▁for ▁the ▁government ▁as ▁an ▁architect ▁for , ▁as ▁it ▁was ▁then ▁known , ▁the ▁Department ▁of ▁Public ▁Works . ▁ ▁By ▁the ▁ 1 9 0 0 s ▁Ban ff ▁National ▁Park , ▁as ▁it ▁had ▁become ▁known , ▁was ▁increasing ▁in ▁popular ity ▁and , ▁by ▁ 1 9 1 1 , ▁had ▁become ▁accessible ▁by ▁autom obile . ▁A ▁visitor ▁pav il ion ▁was ▁commission ed ▁by ▁government ▁officials ▁in ▁Ott awa . ▁A ▁concept ▁plan ▁had ▁been ▁submitted ▁by ▁residents ▁of ▁Ban ff ▁to ▁Ott awa , ▁but ▁officials ▁rejected ▁it . ▁En vision ing ▁a ▁more ▁ref ined ▁structure ▁Wright ▁and ▁S ull ivan ▁were ▁h ired . ▁The ▁building ▁contract ▁was ▁awarded ▁to ▁Ben nett , ▁Deb man , ▁& ▁Co ., ▁of ▁Cal g ary ▁who ▁aim ed ▁to ▁use ▁local ▁labour ▁and ▁purchase ▁building ▁supplies ▁from ▁local ▁mer ch ants . ▁ ▁After ▁completion , ▁in ▁ 1 9 1 4 ▁during ▁World ▁War ▁I , ▁the ▁pav il ion ▁was ▁used ▁as ▁a ▁Qu arter master ' s ▁store ▁by ▁the ▁Department ▁of ▁National ▁Def ence . ▁After ▁the ▁War ▁the ▁main ▁function ▁of ▁the ▁pav il ion ▁became ▁a ▁gather ing ▁area ▁for ▁tour ists ▁waiting ▁on ▁trains . ▁ ▁Wright ▁and ▁S