Proposed Finance terms

A prospect has sent the following offer for a property we have listed for 625K. The proposed interest rate seems a little low and the length of the loan seems a little high. Can anyone provide and insite on what’s typical these days for these two numbers.

$600k offer

175k to 200k down

Owner finance 375k-400k

25year amortization 4%

7 year Balloon .

Thanks in advance