Familiar enough to gauge an accurate vacancy rate?

PM with any local reccomendations for real estate / prop mgrs in that area that may help me achieve an accurate market value / CMAs.

I will go through the property more throughly and get more accurate number before I make any kind of decision.

It always the most accurate

County GIS is typically not accurate and used for determine tax value only. 

I think I found a great foreclosure in South Knoxville but I want to make my analysis as accurate as possible.

@Joshua Reed - the members that have responded so far are accurate - it can be tough to do deals in and immediately near NYC because of competition, amount of capital required, etc.I would suggest finding and area a bit further away where you can do deals and not have to battle so hard. 

The inspectors observation was more accurate to what I saw.Inspector reported a dog too, which I know is the mom's who doesn't live with them and tenant says he watches occasionally, which I believe hence no overbearing dog smell despite it being a 50+lbs dog.It's a lot of different info to consider, but I also want to keep a good relationship with a tenant who's always paid in the end.Maybe under cautious, maybe over?

Is this at all accurate?

I am having trouble figuring out how to accurately do the analysis.