Then it is going to be a tsunami of sellers and a bunch of idiots on the news crying that they got ripped off by much smarter people who at some point will decide they've made enough money off the commoners that it is time to dump it.

Another common challenge is the tenant quality.

No way, unless you're talking about a multi-family common area.

Quote from @Allison Park: Software is a common question on BiggerPockets.

Hi Kwok,From my experience, it's really common to have to expand your search for comps, either by looking for more than 6 months back or by going more than a mile out.

Based on the graphic presentation of that ad, it shows Robert Kiyosaki, so I thought it would be great to attend this free event and meet him (similar meet the author events are very common here in NYC, so I didn't give it a second thought).

https://www.biggerpockets.com/...12 Frequently Asked Questions (And Answers) About DSCR Loanshttps://www.biggerpockets.com/...8 More Commonly Asked Questions and Answers to DSCR Loanshttps://www.biggerpockets.com/blog/eight-questions-and-answe...What Documents Do You Need for a DSCR Loan?

In STR common markets like Gatlinburg this naturally adjusts itself as most homes are STRs so the entire market lifts to meet their cap rates, and they appraise on those cap rates in spirit, even if not technically. 

:) )4) Do you heat/ air condition the common area?

The detectors simply need a common wire such that one goes of, all go off.