Seller Financing with 2 agents involved

[Gabbie Decu]

Good morning to you all! 
I would really appreciate your thoughts on structuring a Seller Financing offer with 2 agents in the middle. 
The seller has owned this property for 23 years  (free and clear now !)

Asking price for this triplex is 800K .

All 3 units with rentals - expiring Feb 2023, June and August. 

What would be the best approach to start the negotiations? 

Thank you for all those who will take a moment to share their input. 

[William Sing]

For the interest usually it is around the current rate banks are providing. If you can get it lower, that would be great but would make sure that it is a fixed rate since interest rates will most likely be at least in the mid 4's.