Selling property with partner. What type of profit split?

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Hi I'm a newby at this stuff, so any help is appreciated.

Background: Partner puts down 20% of down payment. We finance rest of loan and manage property including repairs. Let's say this is a long term investment (minimum 10 years) property that we will use as a rental. When we go to sell what is a fair/typical profit split?

thanks for the advice...