I have 2 ROTH SDIRA's that each own multiple rental houses. 

There will be more wear and tear and multiple headaches with several different renters.

Multiple investors with decades of experience, some GP, some LP, some skeptics about the entire business in general sense and some bulls who have gotten rich from investing have all chimed in on this you got links to specific case studies from Brian Burke, a seasoned syndicator, a guy check from Melanie p, who makes it a part time job taking the trash out and exposing the shenanigans of one syndicator after another.Greg Scott has an excellent reputation on these forums, and provides a counterpoint to Melanie’s skepticism.

I would guess that you have little or no experience running any kind of STR, and now want to get that experience on the back of someone else's investment, with little or no personal skin in the game, and that's not a good way to build an investment portfolio.

With this scenario we both have skin in the game: His work and my materials.

I have multiple condos listed for sale in Costa Rica.

I'd probably also look at markets that had multiple direct flights form SFO everyday for even more convenience.

I like not worrying about being sued even when the local 2-bit lawyer tells me he is going to sue me (which he has done multiple times). 

PS before the hedge funds jumped in about 2011 to 2012 I was an activce courthouse buyer in Henry county and a few of the counties on the north side of Atl metro so been to many of the  auctions having them all on one day is a cluster .. you have multiple criers crying sales simultainously it can be hard to follow but you can also squeeze out one that folks missed.. we did quite well until the hedge funds knocked us little guys out of the area..

So multiple eyes and local expert providing local cost and input on lifespan.Here is an example that has a part that is more expensive in my market than other markets (unlike most parts that are the same everywhere, so in this case your cost should be significantly less due to both cheaper part and cheaper labor): $1600 40 gal water heater installed (this is good price for a plumber, a little high for a handyman) with expected life of 12 years (i have some that go 20 years and some that die in less that 10 years (mostly rheem die in less than 10 years), 12 years is fair life expectation