Do you have access to the bills themselves? Some of the per unit water and sewer fees did go up, but the net effect would be around a 5% bill increase, not something you'd notice.

If it's just this one month that's been super high and not several months in a row, my guess is that your building was being billed as estimated amount since it opened and then they took a real reading in November so months of underpayment is being tacked onto one bill.