8-flat in Chicago, IL

Looking for financing on fully-occupied 8-unit in Chicago via pay day loans online. Sales price $200,000; building value $280,000. Rent is low in that area, each unit is going for an average of $425/mo.
Borrowers have credit in the 500′s — excellent repayment history, except one has a 1×90 on a Capital One card and the other has a medical collection and a perfect mortgage history. Great income; attorney w/ 60K & health care w/ 52K.
Looking to do seller carryback for LTV balance. Borrowers are prepared to invest $10K-15K… If this has to go towards the purchase price, we’re looking for concession in closing costs.