What explains 'city expenses'?

[timmy827]

Hi, in a game now I see this on the gold hoverover:
Expenses: -33 gold
Cities: -21
Units: -12

Units looks right.
The Building expenses under 'Yield' report lists -9 GPT for buildings (few shrines, one temple, etc)
I assume that's part of the 'Cities' but what is the other -12 GPT from? Is there an innate gold cost to cities (that is well hidden?) or am I missing some other report/subscreen of the interface?

Thanks in advance.

 

[Browd]

Each district costs 1 gpt maintenance, but that does not appear in the maintenance tooltips.

 

[timmy827]

Thanks Browd. Where would we be without folks like you...