Congress previously held office at the Old Congress Building . In 1972 , due to declaration of martial law , Congress was dissolved ; its successor , the unicameral Batasang Pambansa , held office at the new Batasang Pambansa Complex . When a new constitution restored the bicameral Congress , the House of Representatives stayed at the Batasang Pambansa Complex , while the Senate remained at the Old Congress Building . In May 1997 , the Senate transferred to a new building it shares with the Government Service Insurance System at reclaimed land at Pasay .