A lot of skillman got taken down.
There's a pretty cool abandoned stone mansion up on top of zion mountain about 5 mins from there. The icing on the cake is that one of the outbuildings is overflowing with prosthetic limbs. I'm not sure, but I heard Mary's Tower near flemington got taken down too. Seems like anything Wierd NJ writes about gets demo'd. You might be able to get some decent shots at Kings Park Psyciatric Center. You can't get super close to the buildings tho. All the big buildings are fenced off. However, the grounds are a public park so you are actually allowed there.
Pennhurst would be a good one. Many people drive in there and don't get caught. Lots of good decaying buildings too.
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Pennhurst State School History - Abandoned Photography : opacity.us
If you were making a trip, I'd make friends with some of the people here and get a tour guide.
Now I'm off to check out Undercliff.