Gutting a business for pipes...how much to charge?

What kind of apartment building? Townhouses, condos, or or the big multi floor ones? How many apartments? What is the square footage? Are you taking pipes, sinks, etc. only? How far do you have to drive? How many people do you have to pay for helping? How many days are you going to have to spend there? How much would you estimate the scrap is worth? If it is really only the pipes and other cast iron you are removing, I would charge about .30 - .50 per square foot. Of course these prices are only guesses as I can't see the building itself.