It would be an understatement to say that the bank was a large building. The space that had been set aside for additional building was taken up very much by the bank mark out. The idea that Genesis needed a separate bank had not just come from the fact that the Genesis building would be too crowded. It had also come with the fact that there would need to be a great number of transfer and recording runes there. The space wouldn't allow that in the Genesis building.
The bank would be responsible for safeguarding gold and extremely valuable items. This meant that they would need extremely dedicated guards. It also meant that the staff would need to be highly educated. Luckily, Markus raven was already there training the two demons along with other staff. He had taken full control of the city's funds along with the flow of gold to the bank.