If this part of the article is true, why would a landlord go to a unit because the tenant had called to say they killed someone and showed them a video of a dead person? 

Take a look at BP's blog where new articles are published every day: https://www.biggerpockets.com/blog4.

Take a look at BP's blog where new articles are published every day: https://www.biggerpockets.com/blog4.

Check out this article from @Joshua Janushttps://www.biggerpockets.com/member-blogs/14702/97710-the-c...

That is what I did here when I started investing in 2020.Here is an article with more information on what a house hack is www.rocketmortgage.com/learn/house-hacking

In other words, did the appraiser not include any relevant comparables and/or data/facts, that would be better support for the Subject in the market.

@John S.You won’t know for sure until you send them out, so you just have to factor it in—consider how many gross inbound calls you’ll get and how many of those will be relevant to you.Then, calculate the cost of the data plus the cost of the mailers.

If you base your research on homes that sold 11 months ago, and take 8 months to remodel the house, those sales will not be relevant anymore by the time you finish. 

Here's some articles that might be helpful for you:http://www.timesharescam.com/blog/191-how-to-verify-if-a-timeshare-rental-company-is-legitimate/http://www.timesharescam.com/blog/57-timeshare-rentals-timeshare-fraud/http://www.timesharescam.com/blog/131-timeshare-rentals-by-owner/Good luck!!

The article https://www.thetaxadviser.com/newsletters/2021/feb/final-sec... is one source of helpful info on this topic.