Creative Financing on Office space

[Himanshu Jain]

I am talking to a seller that has office space that he owns free and clear. He wants out and is open to creative financing. The office space is around 3500 Sq Ft and his not leased out right now. I am looking for what creative financing options can I present it to the seller so that it is win win for all. I will use part of this space and the rest I will lease it out. Also, what would be a good way to estimate the price for the property with  (90 -100%) seller financing.