The most common reasons for buying a shelf company is to achieve some specific objective, other than simply "formation".

Aspiring investors might have a head start with these properties because of the value-add opportunities they offer and the reduced equity requirements.It is essential to reevaluate objectives and progress as one gains experience and builds a portfolio.

If your objective is to build a portfolio in the area, a buy-and-hold strategy might be more beneficial in the long run.

Slow/no draining drains Drains that are clogged by hair, toys, or other non-flushable objects

If you trust the sponsor and the strategy aligns with your goals and objectives they can be a great investment vehicle. 

Set your rates to meet your objectives over a 3 year time frame.  

There's nothing wrong with choosing to rent at a rate they can afford in order to help them if that is your primary objective.

Also, equity building at the expense of cashflow should not be an objective of yours if you're new.

Just want a fair price for his share and the way the discussion have gone, I'm looking for a little ammo or objective formula to use to simply it all.  

If you are considering making a proposal that is structured as a purchase with and without owner carry, each scenario should meet the aforementioned criteria, that is a deal that produces a satisfactory return that also meets the Seller's objectives.