I’d just check out comps in the area or talk to a local agent to get a ballpark idea of value.

Do you check Landlord references?

Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

Another thing I do, which might just be a personal habit, is check Redfin or Zillow for property listings.

Check out will it is still in beta.

Here are a few suggestions on how you can maximize the wealth of information available: Check out the blogs and podcasts, or take advantage of the search feature (magnifying glass).

Check out my profile.

It's always worth checking recent reviews to ensure you're getting someone who can move at the speed you need.A quick Anecdote: I had a friend who went through a similar process recently.

The meters, bills, old permits (should be available through the city planning), the appraisals, etc.Most appraisers check with the city on permits and non-conforming use while doing their research. 

I was recommended to check out Maverick Investor Group and it certainly seems appealing that they find the deals for you as well as offer many guarantees on the rehabs and such.