Don’t close your bank account just yet. Inevitably you’ll have something to settle up for with the buyer or with a utility company (e.g. security deposit refund) etc. But I would probably turn off all ‘auto-pays’ from your bank account.
Yes to transferrring the utilities to the new owner. Don’t forget your phone too.
Make plans for what is happening to your employees and their pay. Stopping auto-payment? Paying a ‘thank you’ bonus? Other?
To your continued success,