The simple act itself is not corrupt. Illinois' budget is also in a financial hardship, from what I have read. In my own reasoning to answer the question of, what is behind making a change to legal addresses like that. The only answer I have come up with based on the opinions I have heard of corruption in the government, is that it would be nessecary to fabricate entire MBS or parts of MBS, that then could have been sold to the treasury at par value. The address changes happened while they were accepting the 4 trillion plus, in mortgage backed securities that they now hold.