If the SFRs are in different types of neighborhoods or different types of houses, you need to adjust accordingly for the changes to achieve an accurate value.

How would I get accurate comps?

@Ryan D. thanks, i've never heard of Rentometer I'll give it a try, I tried using Zillow however they didn't seem very accurate at all.  

I've noticed a lot of not so accurate information about how the home depot and lowes work.

Accurate Rents - no, I am not just going to trust what I find on Craigslist/Padmapper/ZillowThank you for your input, I greatly appreciate the minds here on Bigger Pockets.

@Zack Broaddus One of the most important things when it comes to localized SEO is keeping your listings and business information across all of the different platforms accurate and consistent.

Neighborhoods have sub-neighborhoods which you will want to deeply understand so you can plan your rehab budget, rental rates, exit strategy, etc. and apply accurate assumptions. 

@Christopher TellesHow accurate is PN?

If house C is on the same block and in average condition, house C will likely have the most accurate Zestimate. 

Put your own name in and city to see if how accurate this amalgamation of public data can be!