The huge four major roads would be connected to the central district of the city, a place that Alexander intended to make his nerve center of the city.
This part was previously the marketplace, intuitively chosen, because it was at the center of the city and so people could easily come and go as they wished from all four parts of the city.
And Alexander had intended to keep it that way at first, instead placing the administrative buildings to the north of the city.
But it was Menes who raised an objection to this, citing it would be dangerous to place such important buildings so close to the gates, as in the case of a siege, these important buildings, with all the important heads of the city, alone with carrying thousands, if not tens of thousands of precious documents, everything would be vulnerable to enemy siege weapons.
And after thinking about it a while, Alexander agreed.