Bots, large crowds, multiple disasters, many different dinos....
Wouldn't be cheap.
I know next to nothing about Hollywood accounting. I often suspect that Hollywood accountants understand even less than I do.
They claim that ULTRON production, with all that different stuff going on, was 150 million. They claim that TOMORROWLAND, with fog and lots of converstions in vehicles and in front of display screens, was even more expensive than ULTRON.