Leverage a Note for Down Payment

[Robert Clifford]

I'm under contract on an operating business with real estate.  I have some rental properties that I'm considering selling and got an offer today for a "Subject To" sale, where they'd give me about $120k over the mortgage balance - in 60 months.  I'm wondering how/if I can use this note as collateral for the upcoming operating business purchase.  I'm going to look into selling the note as well but thought I'd start with having my cake and eating it too.  If you have experience with this, please let me know.