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I think this is a question to which the answer is unknown. There are lots of rumours, such as you can walk from Oxford to Cambridge on college owned land. Most are probably not true (see discussion on the Cambridge wikipedia page linked below for example), but what is true is that some individual colleges have massive incomes from rent (and also a lot of wine - vineyards are popular land purchases/gifts).</p>
<p>[Trinity</a> College, Cambridge - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Trinity_College,_Cambridge]Trinity”>Trinity College, Cambridge - Wikipedia)</p>