A skilled real estate agent is a great resource as well, as MLS databases to give them access to extremely detailed physical data and sales records.

Also I would like to get access to MLS data.

Account ClosedSome of the invaild mailing address data on the tax records can be found by searching for the owners name through white pages or intelius.Frank

Although I look at "city data," something like the comps you have would be a bonus. 

My footprint is significantly wider, but I basically did a multi sequence drop to companies that met my criteria.I'm sure your next questions will be, where did I get my data and how come so many people responded?

Those HUD numbers are from statistics taken from lots of housing units all over the place, and no single one of us could gather that data from our own units. 

In some counties you can get this data for free off the county recorder's web site.  

Sure you can adjust the percentage up or down depending on your market, but if your goal is to invest for cash flow, then it seems like you need to meet a certain baseline rent ratio before an investment will warrant further consideration.If that rule is met as a screening criteria, then you dig in and start running the more detailed numbers to determine if the returns are actually there to make the investment worthwhile.

How did the timing work out for how long you could consider the data before having to put in an offer.  

No offense meant to @Jeremy T. but I must respectfully disagree about the usefulness of that City Data, Allegheny County Crime Map.