High utilies detective

[Jeff Stein]

How do you investigate why a building has a high utility bill?

To provide some background, I am purchasing a 14,500 sqft. office building that is mostly empty. The average electric bill $2,200/mo compared to my other office building that is larger at 20,000 sqft where I pay closer to $1,200/mo.

Is there any good way to figure out why the bill is so high? And/or ways to reduce it significantly?

This new building does have an old boiler and A/C but i cant imagine this is the only reason, but I dont know how to go about and determine it.