I believe, in times where you're turning losses of over billions, parks are a mere footpath in your cleansing. While this may not be the "best" option for councils and states, it is a one many will take to reduce losses.
Put yourself in their position. You're given a task, to cut the losses by whatever means possible. You've got the industrial side, which contribute a lot of your income - don't really want to close them. You've got residential side but that will create homelessness and poverty and really doesn't solve anything. You've got commercial side, which like industrial makes income. The only thing you can take away is the places in between these sectors, places such as parks, schools, hospitals, police stations - any place that is provided by the state and paid by the state.
Of course, like I said, this isn't the best way. You can make taxes higher in both industrial and residential. Or make higher taxes in the commercial thus making prices higher on consumer goods. Depends on the state.