Because that individual will also be renting your investment, you will receive accurate data about rental rate.  

@Hjiorst Fjioordsit seems like you may have to report the income reported on 1099-MISC line 3 on schedule E.If you get a notice from the IRS - you can explain your situation.Are you confident that you prepared your return accurately?

Rentometer is more accurate in some areas than others. 2.

Both sites are fairly accurate but they can still be too high or too low.

Hello BP, I need to know how accurate is Zillow house value for estimation?

I got a civil engineering firm that can survey and apply for subdivision for 10-15k but I have no idea how likely that gamble is to succeed so I can't really calculate ROI.

As part of this you need to know or have someone on your team who knows how to accurately estimate any renovations required.

Can anyone break down for me what a "proper" or "accurate" Rent Roll would look like?

They don't like dealing with money they don't know where it came from (drugs, prostitution, gambling, theft, blackmail, fraud and so on.)

(i,e, they figure it out 5 years from now when they reassess again, can they charge me for the previous 5 years for the more accurate amount?