Owner financing negotiations

[Michael Behr]

Found a property that mentioned owner financing. 152k was the asking price. Market rent is 850-1250 on affordable housing it has 1400

This was there terms for owner financing

Here's the info I got:

The seller said if he owner finances the purchase price will increase to 175,000 and the down payment will be 20,000. It will be a 20 year note and the monthly payment would be around 1500-1600. They came back and said it was negotiable. What is a good offer to put on it if any?