I wasn't as clear as I should have been. According to the article the city can't continue to rent to an organization that discriminates at the dollar per year it had been charging. Apparently it can rent to anyone so long as they're paying fair market.
So "discrimination" is illegal at $1.00/year, but perfectly legal at $200,000/year. Do you still think "discrimination" is the issue in this case?
Perhaps "discrimination" is the City's excuse in this case.