The old Oberpostdirektion is not an office building in the sense described on the website. However, this building is very central and striking in Hamburg and deserves attention. It was built for Deutsche Post between 1883 and 1887 by August Kind and Julius Raschdorf. In 2011, it underwent extensive renovation by https://lh-architekten.de/office. Today, it is home to medical facilities and municipal businesses. The old stairwells have been preserved and are a delight to behold: https://abendfarben.com/hamburgs-schoene-treppenhaeuser-dammtor-hauptpost