Declension of the word "Altbau"

Singular and plural for Altbau, m, mixed declension     translation to English old building

Singular
Plural
Singular
Nominativ (Wer? Was?)
der Altbau
die Altbauten
Genitiv (Wessen?)
des Altbaus / Altbaues
der Altbauten
Dativ (Wem?)
dem Altbau
den Altbauten
Akkusativ (Wen? Was?)
den Altbau
die Altbauten
Plural
die Altbauten
der Altbauten
den Altbauten
die Altbauten
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