Hi Blair,
I am a bit surprised, too, by the advice you were given. I wonder if the rep could possibly have been thinking of this entry under the heading of 'ineligible business models' on the Google Places Quality Guidelines:
"Rental or for-sale properties, such as vacation homes or vacant apartments, are not eligible to be listed on Google Maps and should not be verified. Instead, verify the listing for your sales or leasing office or offices. If you have a property with an on-site office, you may verify that office location"
It says right there in the guidelines that if you have a property with an onsite office, you can verify it, and that appears to be what you are describing, even if it will be closing in three years. I guess maybe it's a grey area and you probably shouldn't go against what Google has told you.
If, despite what they said, you decide to go ahead with the plan, it's a bit hard to advise you. Right now, if a business needs to be closed, there are specific options, some of which are described well in the Google And Your Business Forum thread:
https://productforums.google.com/forum/#!searchin/business/mark$20as$20closed/business/ybLoj6VAtMk/EwGnYbVT9aoJ
But, what the options will be 3 years from now, who can say? So, you'd probably need to look into this again when the time comes.
You would also need to try to shut down any citations you may have built, or they may cause a new Google+ Local page to be automated. Hope this helps!