Here in San Diego, at the parks and beaches, we had huge wonderful concrete buildings with all the amenities. We have one right down the street at a small local park. Well, the buildings became a hangout for 'bad' activities, and then the transients MOVED IN, and claimed them as their 'homes'. So now the facilities are locked up tight most of the time (especially at night). I was afraid to go into our local one. Dark, no lights, all stalls with no doors, and more than likely transients sleeping in the corners or doing 'other' things. Ugh. There is no good answer.
Actually that 'semi-private' one by the train tracks was a good idea only it needs to be rethought. More coverage but not a solid wall. Maybe just a curtain you could pull around the entire thing and not all the way to the ground. Then you could see feet if someone was in there.
I wonder how much the 'inventors' of this little project got for their planning?
WARNING! This person is extremely blonde...please type SLOWLY.