▁the ▁Cooper ative ▁Business ▁Bank . ▁The ▁building , ▁which ▁is ▁considered ▁the ▁most ▁beautiful ▁L jub lj ana ▁building , ▁was ▁designed ▁by ▁V urn ik , ▁while ▁the ▁decor ative ▁fac ade , ▁using ▁the ▁Sloven e ▁tr icol or ' s ▁" n ational ▁colors " ▁was ▁actually ▁created ▁by ▁Hel ena ▁V urn ik . ▁▁ ▁In ▁the ▁late ▁ 1 9 2 0 s ▁he ▁turned ▁to ▁a ▁purely ▁functional ist ▁architecture ▁and ▁designed ▁the ▁headquarters ▁of ▁the ▁Sloven ian ▁S ok ol ▁movement , ▁known ▁as ▁S ok ol ▁Hall ▁or ▁T abor ▁Hall , ▁because ▁of ▁its ▁location ▁in ▁the ▁T abor ▁quarter ▁of ▁L jub lj ana , ▁and ▁two ▁very ▁similar ▁structures , ▁one ▁in ▁Gol nik ▁and ▁another ▁one , ▁which ▁was ▁destroyed ▁during ▁World ▁War ▁II , ▁in ▁K ran j . ▁He ▁rejected ▁the ▁search ▁for ▁a ▁" National ▁Style ". ▁▁ ▁In ▁ 1 9 1 9 , ▁V urn ik ▁managed ▁to ▁establish ▁a ▁department ▁of ▁architecture ▁within ▁the ▁Techn ical ▁Fac ulty ▁of ▁the ▁University ▁of ▁L jub lj ana . ▁Upon ▁his ▁inv itation , ▁the ▁great ▁Sloven e ▁architect ▁Jo že ▁Ple č nik ▁became ▁one ▁of ▁its ▁found ing ▁fac ulty . ▁▁ ▁Nevertheless , ▁a ▁rival ▁relationship ▁developed ▁between ▁the ▁two . ▁V urn ik ▁thought ▁it ▁was ▁Ple č nik ' s ▁influence ▁in ▁the ▁conserv ative ▁circles ▁of ▁local ▁Sloven ian ▁policy - m ak ering ▁that ▁prevent ed ▁him ▁to ▁carry