It can be a flat fee or a percentage. 

Lay it flat and put a bunch of dowels between them then when it's lined up, start pulling out the dowels to make contact, and roll it down with a heavy roller (or a can of something) to keep it smooth and keep pulling out the dowels as you go. 

Or at the least taking professional looking pictures and doing a flat fee listing on MLS, and willing to pay Buyer's agent 3% so you don't eliminate a large part of the market. 

A flat dollar amount or interest rate on the money he put in, or a percentage of the profit?

Some things cost a lot more but other things end up virtually flat. 

After a little reading here and there, I figured my best plan is to save up while I'm in college and then buy a 2-3 flat, live in one apartment, and rent out the rest so my tenants essentially pay the mortgage.

My offer has not been accepted yet but I am hoping for the best.The property is a zoned 2-flat with illegal third attic unit.

I am currently sharing a sofa with my fiancé in a studio flat that has a hole in the roof.

This year I saw that damage did progress and called him again, we met and this time he just flat out refuses to deal with it.

So I have a 2-flat in Little Village and I have a structurally unsound one-car garage that I need torn down and a 2-car put in its place.