Usually we are the first most visisble entitiy on site so we draw the wrath of the "radical preservationists"; this had only happened to me two times in my career and both times I was able to shift the focus away from us by explaning that we didn't make the decision etc. Sometimes peole feel like the demo contractor is the one behind the whole process.

I let a small group into the last power station I demolished. They were polite and asked first. They could have just waited until no one was around and did it anyway.
They took some great pictures and gave me copies
Here is an interesting website:

Sleepy City | urban photography

See, now why can't they all be like that?

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Let me say that I have been on both sides of the coin, I am not a contractor or involved with anyone, I enjoy seeing the machines at work.

After listening to what you folks have been discussing I just realized I know what your talking about, you must work for Geppert Bros and the facility you speak of is Philadelpia State Hospital or (BYBERRY) as it is refered to by those who live near it.

I will never damage anyones equipment or do harm to anyone on a site I am there for positive reasons only photography that is all...

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http://i84.photobucket.com/albums/k1...on30/boom1.jpg

Yes I do work for GBI, and I am speaking of Byberry.
And in your defense, I saw many photographers that came due to wanting to see our machines at work. We more than welcome that kind of curiosity. I'm sure with any other demo contractor out there, we love to show people what we can do.
It becomes worrisome to a contractor when you have people playing in partially demolished buildings, destroying excavators, and issuing death threats against a mayor and governor in hopes of protecting their beloved buildings.