Can this work????

I am getting ready to write a contract for a 9 unit apartment building. The building is selling for 240K and I want to put as little down out of pocket as possible. Is there a limit to the amount the seller can give back at closing and how does it have to be disclosed in the contract? Can i call it a maintenance fund? I am looking to have the seller hold a second for 10% and then try to get cash back for about 5% and then put 5% of my own down. I have good credit (700) but not a ton of cash. This is definitely a money maker once I get the property financed. Any suggestions to get this to work?

I can provide any additional info needed.
Thanks

What state is this in? What is the appraised value?

I have not done an appraisal on it yet but it is probably close to 300K(According to county auditor which is usually lower than actual appraisal). I have always been told that the lender will only loan based on contract amount rather than appraisal amount. It is located in Ohio.
Thanks

This is going to be hard to do without at least putting 10% down. Is there any way to reach 10%? Mayb a heloc on another property?