We assume 25-30% down, 6% interest, and 25yr Am when running our numbers on parks of that size. Depending on the length of the balloon, you can get a lower interest rate. For example, for a 5 year balloon, you can usually do better than 6%. A 7 year balloon will typically cost you 50 basis points making 6% pretty realistic. I'll take 7yrs over 5yrs all day though.