$90k upfront plus $12k /year? Perhaps these public restrooms are better than the alternative, but it seems to me that Germany has successfully solved this issue for far less cost by partnering with local businesses [1]. For just the cost of one of these toilet's maintenance you could have dozens of businesses open up their restrooms to the public.
[1] https://www.fastcompany.com/3065278/german-cities-are-solvin...