This is from the 28 August 2017 Bloomberg Businessweek:
Salaries and wages: $1.8 billion
Services purchased (catering, security, etc.): $583 million
Benefits: $530 million, roughly equal to the revenue from graduate programs
Depreciation: $338 million
Real estate (leases, utilities, etc.): $345 million
Other (subcontractors, publishing): $323 million
Supplies and equipment run $257m, scholarships $142m, and interest on the debt $235m, with travel expenses, advertising, and postage at smaller amounts.
Total operating costs are $4.7 billion, with undergraduate tuition covering 6.4 percent of that, graduate tuition covering 11.2 percent.
That is from Kyle Stock, I cannot find it on-line. (I am a biased source, but do note that the new, gated version of Bloomberg Businessweek is consistently excellent.) One of the difficulties with scaling up, of course, is that Harvard cannot always so easily scale the quality and resources of its donors. “Harvard as we know it” may be as large as the current set of donors can support. And “Harvard as we know it” likes…”Harvard as we know it,” not some other Harvard.