Belle Isle Zoo as well as the aquarium have been closed for quite some time. I haven't been to Belle Isle in a long time. I'm sure a few things have changed there, but not much according to Google Earth.

I remember going there once when I was young walking on a platform until I got to the end of the zoo. Now the property remains vacant.

It's true, Detroit does have a lot of vacant property lately, and for those that object to getting rid of "assets" it seems that these "assets" aren't being well taken care of and should be sold for a good price to help the city get out of debt.