I believe agents have the access for this kind of information.

I'm a licensed Realtor both in PA and New Jersey so I have access to several profitable investment properties a month. 

Those places with the smaller splits can offer to train you, they offer free company cards, free professional photographer services, free web program access that will help market your business, etc.

They would of skewed that story to prove a point, if you know a realtor or mortgage broker/appraiser you can access the raw data, use the raw data to calculate your own appreciation rates.

You'll want to find a realtor or some one with access to the MLS there in your city.

I heard some attorney have access to those files ? 

And there is at least one neighborhood split up between district 204 and Oswego East.The 203/Naperville district has a few outliers in Lisle and Warrenville that have better access to 88 and quicker to Chicago.  

If not, then viable comps may not exist.If you don't have access to your local MLS, have an agent run them for you.  

I grew up in a investor family and have access to a competent constructor (my father who owns a contruction and investment business in Germany)Furthermore I have about 25-30k which I am planing on using to do the rehabs.

Or do you mean that you are licensed and you have access to the MLS?