Hakaniemi
Famous buildings include the round Ympyrätalo building ( architects Heikki and Kaija Sirén , 1968 ) and the ( architect Karl Hård af Segerstad , 1914 ) . 
<triplet> Ympyrätalo <subj> Heikki <obj> architect <subj> Kaija Sirén <obj> architect <subj> 1968 <obj> inception <triplet> Heikki <subj> Kaija Sirén <obj> spouse <triplet> Kaija Sirén <subj> Ympyrätalo <obj> notable work <subj> Heikki <obj> spouse <triplet> 1968 <subj> 1968 <obj> point in time <triplet> 1914 <subj> 1914 <obj> point in time