Alternatives to seller holding a 2nd ?

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I have  a seller on a $4m commercial property that was willing to hold a 2nd.  As time went on and he realized that he would be in 2nd position behind the bank I was using to finance a part of the deal ... he balked.  Apparently he lost a property in the mid 80's, while he was  holding a 2nd and he doesn't want to get burned again.  Are there any other ways to structure a 2nd where I can make the seller feel warm and fuzzy ? 

A COUPLE OF MAIN POINTS :

Seller is not a business man.  He is a scientist by nature and so is his company

His company will be leasing the building (5yr) so all rent is coming from him.

His 2nd will have a 4yr balloon so that he will be paid off before the lease runs out.

I offered to use a loan servicing company so he is sure that the bank, then his 2nd, and then I, get paid.  In that order.