Getting help with relocating is a must to move your large items, such as furniture, tech, and cars. You may have a lot of expensive equipment you need to move, which can be dangerous if you are not an experienced mover.
Depending on your insurance and the suggestions from your Human Resources Department, you may be able to require your employees to move their own belongings. More than likely, your employees have lots of their own stuff in the office, especially in their lockers and on their desks.
Getting rid of things you no longer need before the move will reduce the amount of stuff you need to relocate. This may result in needing fewer trucks for the move and save you a lot of time when you unpack in the new office.