Buildings/Alliance Center

The Alliance Center is the main building for to Help and get Help from your alliance members. When you press the Alliance Help button, your alliance members will see a "Hand" over this building in their city and when they press it, your remaining queue time will decrease. You can be helped with building upgrades, research, and troop healing. Troop training and gathering do not benefit from the alliance center.

Game Mechanics of Helping
The amount of time removed per help is 1% of the remaining time or 1 minute, whichever is greater. The amount can be increased by researching in the Alliance Technologies. At max level research, each help will be 1% or 3 minutes, whichever is greater. The Alliance Center starts at a maximum number of helps of 5 and that increases by 1 per additional level.

Some examples of how this works:

Side Quests
Rewards are given via quest completion for upgrading this building.