Went there recently and on there's a back left building (if you're looking at the nursing home from the main road side) which has cameras pointing every direction. If you're sneaky and find a route you can get past them, but don't go out in any open spaces or up high or you will get spotted. I made the mistake of walking in front of a few without realising. About half an hour later heard someone pull up and get out and say something along the lines of 'they might still be here' then the crunching of glass of people walking around. Luckily we were close to an exit and left immediately.
Exploration is an addiction.