I just did a 1031 exc from Ca to Az SFRs right before the end of the yr. Prior to closing I had sellers of a 6plex and 4plex lined up but after I closed on my sale they backed out deciding to just refinance their places and buying new investments. We didn't sign any agreements as my property was for sale then closed within a very short amount of time with a cash buyer. I found it very hard to find multi properties in areas without severe weather issues (in my identification time) that were in nice enough shape to not have to be rehabbed. I looked around for quite a while for and found a great realtor & Property Mgr. I drove out, found the houses and closed on them. It was a real seller's market and crazy out there right now. On purchasing the SFRs it is taking a little set up. It depends on what passive is to you. I have had out of state properties using Property Mgrs and one without one. On these I just got I can live off the cash flow. It is passive enough for me.
In my brief researching of NNN, DST and REITs, none of them fit my purpose or interest. I am not familiar with nor have I ever purcahsed NNNs. I really tried to see if these would work. There was too much of a learning curve for me with the time I had and from what I did see, it was not for me. I also looked into mobile home parks. My accountant advised against it. Mobile homes are not real estate unless you get the land with it as well. I didn't see that being as passive as I wanted, had again a new learning curve plus the exit strategy didn't seem as preferable as SFR or multi-units.
I wish you much success with your exchange. There are time limits and it is very important to have your ducks in a row.