Why do I need to upgrade buildings?

The cooler the building is, the more profit it brings; it’s simple enough. Upgraded entertainment buildings bring more profit, hotels provide better events, power plants produce more electricity; moreover, buildings look much cooler when upgraded.
Improve buildings by tapping on the Upgrade button in the lower part of the screen. You can also speed up the upgrade: just tap the ‘snail’ button and the process will finish instantly.
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