On the opposite side of the Main is the district of Sachsenhausen.
As the historical center of Frankfurt, the Altstadt has existed from Frankfurt's beginnings, dating back to 794 (first mentioning of Frankfurt).
The Altstadt contains many of Frankfurt's most important sights, including the Römerberg plaza with the famed Römer city hall and many other middle-age style buildings which are mostly actually reconstructions. Bartholomäus Cathedral and the Paulskirche, the short-lived seat of the German National Assembly in 1848-49.
Museums and theatres dominate the western part of Altstadt and service jobs are a major part of the economy, especially along Weißfrauenstraße and Berliner Straße.
It used to be part of the original Innenstadt area, which lay inside of the city walls, the Staufenmauer.
Only very small sections of the Altstadt were rebuilt after World War II and so only a few old buildings are actually preserved.
This is above the ratio of the entire town, but far under that of the other town quarters.
The adjacent Neustadt, for example, is home to 44% non-German inhabitants.