Client asks sale with leverage. Smart...... or not?

[Wilmar Treffers]

I am looking for advice for a situation completely new for me. We have a lead that asks to leverage $90,000 as 10% equity down payment for long-term (10-30-Years with no balloons/calls shorter than 10-years). CFD holds by seller(s) and to generate to the Seller no less than 8% interest, given a producing CAP rate of +15%.

So the total deal is $900.000k

His question is clear, I think a lot of buyers want a deal like this.

Still I am curious because the first calculations look profitable (with the assumption that refinancing at 5% for 20 years is possible).

At this moment I have a part of the required portfolio, lets assume $200.000 value.  

Is it possible to refinance the contract that we make with the buyer and profit from this? Or is it not smart and just use our assets to leverage our own portfolio?

Your advice is highly appreciated.