I have a ESXi VM but do not know the password to the system. I also do not know the password for the VSphere Client. The IT person who used to be here is deceased. We are moving buildings. What can I do?

We are moving the network to a new building.  I have no way of getting the password for the ESXi machine or the VSphere Client.  (I can't even figure out if we do have support because I do not have access to that documentation.)  Am I able to shut down the machines in the server room, move them over to the new facility, fire them up, and expect to work?  Just like everything else I believe you have to log in to the machine for it to work.  What are my options?  I am new to the ESXi system.  I don't have the passwords and need to move this network.  Please help ASAP!