itions , ▁the ▁work ▁being ▁completed ▁in ▁ 1 9 8 4 . ▁▁ ▁This ▁new ▁wing ▁was ▁built ▁at ▁the ▁east ▁end ▁of ▁and ▁at ▁a ▁slight ▁angle ▁to ▁the ▁ 1 8 3 1 ▁structure , ▁the ▁roof ▁being ▁co pper ▁and ▁the ▁exterior ▁walls ▁of ▁the ▁same ▁m ason ry ▁as ▁the ▁adjacent ▁buildings , ▁but , ▁using ▁more ▁reg ulated ▁block ▁sizes ▁and ▁a ▁fl atter ▁relief ▁of ▁pil aster s ▁and ▁windows , ▁as ▁well ▁as ▁less ▁detail ing ▁overall . ▁The ▁wing ▁contains ▁a ▁separate ▁entrance ▁and ▁cer emon ial ▁fo yer ▁with ▁tw in ▁spir al ▁st air cases ▁asc ending ▁to ▁a ▁piano ▁nob ile ; ▁the ▁st airs ▁have ▁wood ▁hand rails ▁with ▁al umin um ▁pick ets ▁and ▁between ▁them ▁is ▁a ▁n iche ▁for ▁sculpt ure . ▁On ▁the ▁upper ▁level ▁is ▁an ▁event ▁space , ▁l oun ge , ▁and ▁sun room ▁with ▁a ▁terra ce ▁over looking ▁the ▁St . ▁Lawrence ▁River . ▁The ▁former ▁two ▁areas ▁are ▁fully ▁bar rel ▁v ault ed ▁and ▁linked ▁together ▁by ▁a ▁continuous , ▁narrow ▁sk yl ight ▁in ▁the ▁roof ▁under ▁which ▁cry stal ▁p end ants ▁of ▁different ▁lengths ▁hang ▁and ▁transfer ▁the ▁natural ▁light ▁into ▁the ▁rooms . ▁Inter iors ▁of ▁the ▁modern ▁addition ▁were ▁designed ▁by ▁Quebec ▁artist ▁Made le ine ▁Ar bour , ▁who ▁was ▁inspired ▁by ▁the ▁colours ▁of ▁winter ▁in ▁Quebec , ▁and ▁use ▁Canadian ▁materials , ▁including ▁gran ite , ▁wal nut , ▁and ▁al