You can enter your desired market to see what comes up, then record your data for analysis.Anthony 

Most of this data is free from NAR and your state real estate association.

According to Co-Star (a non-res search engine & data provide for commercial brokers), Q3 in the Denver market saw Industrial at 4.1% vacancy (national @ 6.7%), Office at 9.8% vacancy (national @ 10.6%), and Retail at 5.1% vacancy (national @ 5.7%).Regardless, welcome to BP!  

I was incredibly impressed with the thorough analysis and insightful perspectives of the interviewees as well as the thoughtful approach from those that compiled the data in an effort to present the findings and views in an easy-to-understand medium for the public.

Overall, based on city-data the neighborhood is fairly decent with low-average crime rate. 

I purchased a list but the data was terrible.

@Bryan Colton I've done some of that also, but I want access to roam the MLS as I please and pull data. 

I know how to get lists from title reps, Melissa Data, List Source, etc but none of these provide things like homes with code violations, Unlawful Detainer Actions (evictions), or deceased owners.

Something is off in your data.  

Now I decide to run my numbers on three differet properties; I get all my data, the vacancy rate, the bills, maintenance costs, property management costs, real estate taxes and so on...In one case, I see that the advertised price is 120.000 and the NOI is 10.000.