What is the simplest legal way to structure these deals given that every deal will have different partners/investors and the property being purchased for each deal is not defined beforehand?

I'm not joking but youtube will show you have to replace click on LVP in the simplest way. 

Trevor Taylor Trevor you've found the best place to learn about RE in the simplest forms.

Simplest solution would be to contact the owners of other properties in the district to learn who they are using and rates.

Wouldn't the simplest & most logical explanation be that I have given you the price that it's actually going to sell for & you are just wrong?

The simplest model or most advanced is meaningless if you don't know what to put in the model in terms of stabilized rents, renovation costs, expense and income growth assumptions.

General Ledger is probably the simplest tool possible that allows automated transaction download.

You want to address the fact you will be living there in the simplest way w/out adding the rental piece.

Formally demand return of the deposit due to the simplest possible explanation.

Probably the simplest way I've seen, is using a standard "Agreement to Purchase & Sale Real Estate", making sure to have the "and/or assigns", right after your name, which gives you the right to assign your interest in the contract to your Investor/Endbuyer.