We should also never have a revenue stream and make money off a tenant's security deposit.

I just got done making a YT video on the subject, so it's fresh on my mind.

For costs, if you're an investor, you can probably do a video walk through to get a ballpark estimate on rehab.

almost every youtube video ive seen. but I have learned my lesson.

Are there some of the data aggregation sites such at Deal Machine or Prop Stream that have this? 

- We had 2 break-in & furnace & HWH thefts there this year:(File a claim ASAP, you'll need:1) Utility bills to prove electric & gas were on2) A police report, proving a break-in3) Pics/video to prove the condition of the property to support theft claimWhat are you doing to mitigate additional damages?

If you pay cash, you don't have a payment, but effectively you are giving up an income stream if the cash had been in a bond or ETF and earning you either interest or appreciation. 

How about a nice picture of your living room or even the front of the house first, followed by the video games?

Check out YouTube for some videos about that card.

It is not very difficult or complicated to evaluate commercial real estate, there are plenty of good books available that can teach you how, textbooks, online courses, community college classes, even excellent youtube videos etc, and it is actually quite enjoyable in the process to learn.