If you are not already aware, have your Realtor, give you some market data on the area your condo is located in and compare it to other areas in DC.  

I used list source to get my data and then Vista print to print my postcards.

I have a tough decision to make though regarding my data and marketing strategy and just don't have enough experience to make it intelligently. 

You might build your own data base.

There is a lot to navigate such as sourcing private money, due diligence, working with a lender, third party reports, SEC, market data, etc.

Data collection is what you do in order to compile a cold list.Research is what you do when you wish to know or learn more about a topicDue diligence is what you do when you have a lead who has responded and become a prospect or a target asset that you wish to bid on at auction. 

You have to get data from the MLS.

I guess there are pro's and con's in every city.I can't say anything about Milwaukee but I have the following data for Chicago:1) Volume of Sales have Risen in the Past 5 Years2) Months of Supply Have Decreased Substantially In the Past 5 Years3) Foreclosure Filings is A Leading Indicator of Price Movement - As Can Be Seen Below, Foreclosure Filings Have Decreased Substantially in the Past 3 Years4) What's Behind Higher Sales, Lower Inventory and Lower Foreclosure Filings is Excellent JOB GROWTH In The Past 4 Years5) All of The Above Shows That Over the Long Term, Home Prices Are Poised To Go Higher in Chicago (Based on Chicago Case Shiller Index)CONCLUSION: Chicago is a great market for fix-n-flips, rent to own and appreciation plays (with no cashflow).The Downsides of Investing in Chicago?

Are you looking for data siurces (such as city-data and neighborhoodscout), or are you looking for a list of criteria to use in evaluating neighborhoods?

Gather some data.