I know how to get the data from the IPEDS website, but I am not an expert on higher ed finance. If you care to take a look at what is in the IPEDS Finance Report data, here is a link to the forms and instructions. Finance FASB is for private schools, Finance GASB is for public schools. Feel free to take a look and recommend a meaningful method for comparing schools on administrative overhead expenses.
I hope the link works.
Ipeds Web-Based Data Collection Information Page