One of the largest issues for businesses on Google Maps is what to do when you move your business to a new office or location. Google has and continues to tell people to mark the old business address as closed but the issue with that is two fold.
(1) It shows your business as closed on Google Maps, even though you just moved.
(2) All the reviews you have accumulated vanish with that closed business listing.
Google promised to add a we've moved label and about a year after making that promise, Google has come through.
As reported by Mike Blumenthal, Google has added such a label. Now, for some businesses, it says "This place has closed or relocated." The key, "relocated."
Now, this doesn't fully satisfy issues one and two above.
(1) Yes, it says the business may have been closed or relocated but it doesn't say one or the other - it says both.
(2) The reviews still disappear when you go this route.
The instructions on how to do this are at this help document and again, it doesn't seem to fully satisfy everything.
Forum discussion at Google Business Help.