Chu~

I have read in one of the update notes that now buildings can be leveled up to increase skill boosts and etc. How can I do it? Do I need to complete some specific level to unlock this feature? Or talk to somebody (one of NPCs)?

Also, I just would like to say huge thank you to the developer for continuous updates. I haven't played the game for some time and returned to the huge amount of new amazing things! It's so nice to see the game developing step by step and becoming more and more complex