I am being billed for 60% of my entire building's electric bill! Is this legal?

In some cases, Courts won't enforce unreasonable contractual obligations hidden in what one would expect to be a standard form contract containing typical and reasonable terms. Other times they will. Call the Portland Bar Association or the Oregon Bar Association to see if there is either free help available or if they can refer you to someone to look into it for you. Most lawyers won't charge you for an initial meeting, but they may charge you if they need to do research to answer the question.