What do you bring to the table and what do you need from a partner?

Depending on your practice size and income level, you may just want to start with maxing out 401k and also adopting a defined benefit plan before committing to becoming a lifelong real estate investor.  

You could try reaching out to ask questions and maybe that would turn into a sort of mentorship type relationship if adding a partner is not on the table. 

Also, with the size of the units, we knew that we could add a bedroom somewhere within the property.

Now, if they are following SEC regulations, these should be spelled out in the PPM, but they might not all be in some glowing, highlighter-green table.  

It's not a fair partnership if you the tap the equity of their property to use together if you aren't brining any capital to the table.

I had a renter that rearranged all the furniture, left everything absolutely filthy, grease spilled all over the counters and oven, food spilled on the floors and table, trash left everywhere, etc.

I do think it is a good idea to take some money off the table when an asset runs up and diversify.  

Even accurate estimates don't bear out on a small sample size.

On our higher end houses we put stackable in our primary walk in closet I did this in the home I built and live in although mine are stacked they are full size not a combo unit.