Hey there! I went through a similar headache last year when we expanded our firm. The best thing you can do is label every single cable and monitor before the movers even show up. I ended up hiring Boston moving company Flash Moving
https://www.flashmoving.net/ and they were absolute lifesavers for us. They really understand the nuances of commercial and residential moves, so they handled our servers with a lot of care. I recommend doing the big move on a Friday afternoon so you have the weekend to get the network up and running. It really minimizes the downtime for your employees. Just make sure you have a clear floor plan for the new spot so the crew knows exactly where the heavy desks go. It makes the whole transition much faster and less chaotic.