Seller financing using agreement of sale or land contract

[Malcolm Brown]

I'm working on a deal, where I would be using seller's financing. In this deal, the property is worth 110k. The seller has a 65k loan on the property @ 8.5%, payments  of $543.63/month. Property has a tenant on a 3 month lease paying 850 a month.  Seller agrees to 5-10k down to take over payments. How should I structure this deal as far as  closing date? (Because of tenants)  Additional clauses?