1) there's a roof pitch gauge on the App Store that'll tell you your roof pitch quick and easy.2) I'm assuming that by zonal you mean a mini split or ductless system.  

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.

What evidence is there that that is actually happening other than a new grocery store?

We require tenants have a professional carpet cleaning (truck mounted system; no store rental machines allowed).

It's like a successful convenience store offering to sell you just the real estate provided that you don't continue the c-store. 

They report the income on their tax returns, you need to issue them a 1099 if you pay anyone more than $600 (you can download them from the internet or get them at an office supply store) by January 31 of the following year.

Go to your favorite flooring stores and ask what the commercial warranty.

One is an established restaurant and the other a furniture store.

Go to your favorite flooring store and ask what the commercial warranty is.

Tenantagrees not to park or store a motor home, recreational vehicle or trailerof any type on the premises.