 Franjo Klein , a Vienna @-@ born Zagreb architect , was commissioned to build the synagogue . Klein , a representative of romantic <unk> , modeled the building on the <unk> <unk> <unk> ( 1858 ) , a <unk> Revival temple designed by Ludwig Förster . It became a prototype for synagogue design in Central Europe . Zagreb Synagogue used the already developed round arch style ( <unk> ) , but did not adopt Förster 's early oriental motifs . 
