From Wiktionary, the free dictionary
From alt (“old”) + Stadt (“city”). Cognate with Low German Ooltstadt.
Altstadt f (genitive Altstadt, plural Altstädte)
- historic city center, old town
Declension of Altstadt [feminine]
- “Altstadt” in Duden online
- “Altstadt” in Digitales Wörterbuch der deutschen Sprache