- Upgrade : limitations
To avoid unlimited growth of a city, from nothing to unbelievable fortress in one day, you have a limit of upgrades/buying each day, called upgrades count.
Upgrades count is limited to 16 a day, meaning you can buy 16 buildings in a day, or buy 8 buildings and upgrade 8 others, or upgrade 16 buildings, etc...
So, even with massive funds, your city can't grow up in size more than +16 size a day.
In "Stats" panel of a city, actual number of upgrade/buy is indicated.
This number decrease 2 points every 3 hours, meaning the limitation decrease progressively, and let you construct some more from time to time, in order to avoid having to wait a full day each time you reach the limit. All in one, it still makes 16 upgrades maximum a day !
In addition, you can't upgrade a building to a level higher than (grade of the city) +1 for standard buildings, and (grade of the city) +2 for a production buildings.
That means the highest level of all your buildings depends on the grade of the city, which is logical in some way...
Example : at grade 1, a mine could become level 3 maximum, et all other buildings level 2 maximum. At grade 2, mine could be level 4 maximum, and all other buildings level 3, etc...
That forces builders to invest a lot of time, money and attention in a city if they want it to become a great fortress.
In addition to grade and upgrade limitation, troops producing buildings and workshop buildings cannot be upgrade more than level 6, to avoid invincible amount of garrisons/defenses that only froze the game and make fortresses impossible to destroy.
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