▁was ▁built , ▁which ▁surv ived ▁for ▁another ▁ 4 5 ▁years , ▁only ▁finally ▁being ▁demol ished ▁in ▁ 1 9 5 5 . ▁Fall ing ▁voc ations ▁meant ▁the ▁convent ▁was ▁closed ▁in ▁the ▁early ▁ 1 9 8 0 s , ▁and ▁after ▁standing ▁der el ict ▁for ▁nearly ▁ 2 0 ▁years , ▁it ▁was ▁acquired ▁to ▁become ▁the ▁central ▁library ▁of ▁the ▁European ▁Commission . ▁This ▁is ▁the ▁only ▁pre - W W 2 ▁building ▁to ▁be ▁left ▁standing ▁in ▁the ▁area ▁after ▁the ▁entry ▁of ▁European ▁institutions . ▁ ▁History ▁ ▁First ▁church ▁The ▁Sister s ▁of ▁Per pet ual ▁Ad oration , ▁who ▁became ▁the ▁Sister s ▁of ▁the ▁E uchar ist ▁in ▁ 1 9 6 9 , ▁were ▁a ▁chief ▁E uchar istic ▁Order ▁founded ▁by ▁Anna ▁de ▁Me e û s , ▁the ▁el dest ▁daughter ▁of ▁the ▁Belg ian ▁Fin ance ▁Minister ▁and ▁found ing ▁Chair man ▁of ▁the ▁Société ▁Gén éra le ▁de ▁Belgique , ▁Count ▁Freder ic ▁de ▁Me e û s . ▁The ▁original ▁foundation ▁was ▁set ▁up ▁in ▁ 1 8 4 4 ▁in ▁work sh ops ▁belonging ▁to ▁the ▁Church ▁of ▁Our ▁B less ed ▁Lady ▁of ▁the ▁Sab lon . ▁The ▁sister hood ▁rapidly ▁out g rew ▁its ▁location . ▁In ▁ 1 8 4 8 ▁the ▁found ress ' ▁child hood ▁friend ▁the ▁Baron ess ▁d ' H o og vor st ▁( née ▁Count ess ▁of ▁Mer cy - Arg ente au ) ▁bought