That sounds like an interesting investment. Is there a way I as an individual can buy something like this?
In NPR's case, I'd say: (a) it looks like they worked directly with the seller, not with a bank/broker/dealer, and (b) their foundation has $250MM of assets, so they're not exactly a small fry (http://www.npr.org/about/statements/fy2008/fy08nprfoundation... [pdf]).
But it's not a good idea unless you are very experienced (or have someone very experienced helping you).
Otherwise you're pretty much guaranteed to loose money.
Actually no broker will talk to you unless you are a "sophisticated investor", which is another way of saying "has a lot of money", but also you need to have been investing for at least a few years.