Commercial loan with equity as down payment?

[Benjamin E.]

Hi all. A friend wants to sell their property to me (they don't know how to manage and want out) and I want to know if you know any lenders who will do a commercial loan (it is a multi use property) and use existing equity in the building as the down payment for a loan? For example, she wants to sell it to me for 100k and it is worth 150k. The lender requires 25% down. Looking to take the down payment from the equity and pay any remaining difference, etc. This assumes a lender appraisal comes back with sufficient equity, etc. 

I plan on self managing (I have experience) and living in one of the residential units in the building. 

Thoughts? Ideas?