Google Business Listing Verification for Unmarked Facilities

[EvoqueDCS]

We have been trying for over a year to get Google My Business listing verification on our facilities, which are separate from our company HQ.

We have 31 facilities around the world that do not have business signs on them. We have tried sending postcards and are told that no one is receiving them. The folks who receive the mail are guards and it's tricky to ensure they field them.

This has been an ongoing challenge as Google says that the alternate method requires a business sign located next to the building number, which we don't have.

What do you recommend we do to get listed in GMB?