I noticed maybe 2-3 days ago that I couldn't demolish any buildings anymore - maybe came with the new patch? But I'm not sure about that. First I thought because I surpassed the 180 days but I checked to see other savefiles and it's occuring everywhere now. Can't demolish anything, finished buildings or buildings in construction - used or unused, it doesn't matter.... user_end_of_milestone_1-114.json