Several of the palaces and city buildings I made for the different cultures in the game. The palaces are the larger buildings.
Our process in creating these palaces and city halls is usually to first design the palace, and then style the city hall in its image.
Check out Logan Bernatt's page to see how the Maurya Palace, City Hall and Matha ended up looking in game.
https://www.artstation.com/loganbernatt