Some 135,500 m[sup]2[/sup] of office space was let in Frankfurt in the first quarter of 2009, compared to 98,000 m[sup]2[/sup] in the same period last year, according to property adviser NAI Apollo. But the 38% increase in comparative letting activity was largely due to two major transactions, the Deutsche Bahn SilverTower and the former Dressdner Bank which accounted for 72,000 m[sup]2[/sup].