If you're allowed and it's still there, go for the main power wires feeding the building. They should be pretty big and not too difficult to get fast even if you have to cut it out conduit and all then pull out later. I got 1200 lbs out of one pull from a bank we demolished.
When you're dealing with as much weight as you are, it will pay to cut the joints off the copper pipe. Even if you gain 20 cents per lb by changing #2 to #1 copper, you could gain close to $2000 if your weight estimate is correct.
My rule on racing the demolition is take the best first then take everything you can fast not cleaning anything. If you pick it up, load it, figure it out later. Good luck.
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