Thanks all.
"If you really want to be fair you take the value and subtract the mortgage and the actual costs of the sale and split that in half." - yes, agreed. That's how we got to the $70k number, which includes the actual costs of the sale (realtor expenses, escrow fees). The argument for $80 ignores actual costs of the sale.
At any rate, I'm optimistic that we'll be able to meet in the middle with the co-owner. Really appreciate everyone being a sounding board for me on this, which has been very helpful.
"If you really want to be fair you take the value and subtract the mortgage and the actual costs of the sale and split that in half." - yes, agreed. That's how we got to the $70k number, which includes the actual costs of the sale (realtor expenses, escrow fees). The argument for $80 ignores actual costs of the sale.
At any rate, I'm optimistic that we'll be able to meet in the middle with the co-owner. Really appreciate everyone being a sounding board for me on this, which has been very helpful.