▁on ▁a ▁traffic ▁island ▁in ▁front ▁of ▁the ▁building ▁and ▁the ▁P ots d amer ▁Bahnhof . ▁After ▁World ▁War ▁I ▁began ▁in ▁ 1 9 1 4 , ▁it ▁was ▁renamed ▁to ▁the ▁more ▁patri otic ▁C afé ▁Vater land . ▁ ▁Haus ▁Vater land ▁Haus ▁P ots dam ▁became ▁less ▁successful ▁during ▁the ▁ 1 9 2 0 s , ▁and ▁in ▁ 1 9 2 7 ▁was ▁sold ▁to ▁the ▁Bank ▁für ▁Hand el ▁und ▁Grund bes itz , ▁which ▁le ased ▁it ▁for ▁ten ▁years ▁to ▁the ▁K emp in ski ▁family ▁of ▁restaur ateurs . ▁They ▁had ▁an ▁exclusive ▁contract ▁to ▁provide ▁all ▁food ▁and ▁drink ▁and ▁to ▁manage ▁the ▁business , ▁which ▁became ▁their ▁flags hip . ▁In ▁ 1 9 2 8 , ▁the ▁building ▁was ▁re open ed ▁as ▁Haus ▁Vater land , ▁based ▁on ▁an ▁idea ▁by ▁Leo ▁K ron au , ▁who ▁had ▁visited ▁C oney ▁Island ▁in ▁New ▁York ▁and ▁wanted ▁to ▁em ulate ▁the ▁international ▁attra ctions ▁in ▁the ▁am usement ▁par ks ▁there ▁and ▁improve ▁on ▁Berlin ' s ▁own ▁im itation , ▁L un ap ark . ▁He ▁persu aded ▁the ▁K emp in ski ▁family , ▁who ▁had ▁a ▁ 6 5 - year ▁track ▁record ▁of ▁success ▁as ▁restaur ateurs ▁in ▁Berlin , ▁to ▁convert ▁Haus ▁P ots dam ▁into ▁a ▁Haus ▁der ▁N ationen ▁( house ▁of ▁nations ), ▁and ▁became ▁its ▁first ▁art istic ▁director , ▁arr anging ▁entertain ment ▁to ▁suit ▁the ▁flav our