 <unk> , the oldest and one of the largest <unk> in the world , was the center of commerce and business activities in the city . Numerous residential and office <unk> are found within its medieval streets . Plans to make the <unk> area into a business process <unk> ( <unk> ) hub progresses and is aggressively pursued by the city government of Manila . 30 buildings are already identified to be converted into <unk> offices . These buildings are mostly located along the <unk> Street of <unk> , which are all unoccupied and can be converted into offices . 
