Best suggestion I can think of
1) servers (take the entire racks), documentation, backups, certificates (to prove you own what's on the servers), network gear, etc first. Make sure you have EVEYRTHING needed, core-wise, to operate.
2) THEN start loading workstations. If you have to leave some behind, and the place burns down, that's what insurance is for.
You can operate a business on leased workstations.
You cannot operate a business without all your core servers, and you wouldn't want to wait for the downtime required to rebuild them.