Where did the army generals hold office?

Ancient Greece army generals held their office in places called The Strategeion. The Strategeion is a trapezoidal chamber located in Ancient Agora of Athens, Greece and was used as a meeting room of the ten Strategoi of ancient Athens. The Strategeion was built on top of two ancient graves which revealed the presence of a heroic cult that was dedicated to the hero name of “Strategos”, which was later used as the title given to the Athenian generals.

The strategoi were elected each year with one person selected from each tribe. Those selected each year were equal in their ranks and were then the senior military commander for their tribe.