Upgrade Building

Upgrade buildings are special buildings in Bloons Monkey City that give you the option to purchase upgrades for your towers that can be bought in battle. The buildings have you pay city cash and bloonstones to upgrade your towers. The buildings also may house 1 or 2 towers to upgrade, depending on the type.

Gallery
TBA

Trivia

 * After all of the upgrades for a tower become unlocked, the tower buildings on the map change to reflect the final upgrades of their type.
 * The upgrade buildings change appearance as the towers inside are upgraded more and more.