It appears the correct contact for restroom gendering at the University of Minnesota is facilities management, according to emails from the Department of Environmental Health and Public Safety.
The Transgender Commission's email is much more hopeful, although that will likely just concern the Ecology Building. I've inquired as to whether or not their is a policy on the issue. If not that is potential grounds for improvement and to stop all the silly back-and-forthing that seems to be the case here for this issue.
I did notice two other issues as well. The Gender Neutral Restroom Map for the University of Minnesota notes Smith 40 as a multi-use gender neutral restroom. When one goes to this restroom, however, they are greeted by the following sign:
This is not okay. It seems to be suggesting that a unisex restroom could not ever be multi-use. Having used multi-use gender neutral restroom facilities at universities in the past, that is certainly not true. I was not able to go in at the time as someone had locked the multi-use restroom to use it, so I'm not sure if there are floor-to-ceiling stalls or what.
It is also problematic that when one looks at the gender neutral bathroom list, a number of them are under a variety of restrictions, or suggest they are not open to the public (for example being labelled "Staff Restroom"). There really needs to be a clean-up of this system.