Been involved in four successful residential deals over the last few years.

@Russ Scheider, thanks for the multiple messages on different forums.

I'm looking to start slow and involve my college student son.I'm looking to start by renting out my current home and buying a rental after I move.Thanks for having me!

I am emotionally involved in my current house because of my neighbors.

Later, it's sold and I receive 20% of the net profit.This is purely a money deal on my end (no involvement in rehab or rental).Question - If the property sells quickly (say, within 3 months), and since my profit is paid through a security agreement (I never have title to the property), how would this be treated for tax purposes?

Then do another search for that person's name as owners to see if they own multiple houses.

I would say get involved in some aspect of real estate though, local meetups, read through the BP books and look for a house hack.  

Even though the mortgage interest deduction gets SEVERELY reduced in my income tax bracket, I'm still ok with that amount of leverage.Also the opportunity cost of possibly buying another property with some of that down payment money.Cash to buy multiple properties will not be an issue for me.  

2) If it is, how can this be done and how does one calcualte the costs involved in switching between loans like this? 

@Dhru DasI am not heavily focused on MFR, however, that said, I purchased a duplex and a four-plex in 2015 for a JV that I was involved in.