Subto/Seller Finance Deal Question

[David Sohn]

If a seller refinanced a house at around 220k and has about 120k left in mortgage, but the house also appreciated to 450k, how do I structure a subto/seller finance deal?

I'll subto his existing mortgage and pay off the 120k. But as for the seller finance, would the loan to the seller be the difference between 450k and the refinance number of 220k? Or would it be the total equity - so the difference between 450k and remaining mortgage of 120k?

I'm trying to structure a deal for the seller but the real estate agent won't submit my offer to the seller because they don't think the offer is beneficial for the seller. But I just want to start the conversation so we can negotiate the terms so it's beneficial for both parties. But because the seller won't share my offer to the seller, me nor the agent knows what the seller wants. (sorry just venting)