Sourcing Historical Real Estate Data

[Tory Kelliher]

Hi BiggerPockets Community,

I'm looking for some help with historical real estate data research. I am trying to compile historical real estate data going back to before the last market crash, so let's say back 15 years to 2004. I'm looking for metrics like median sales price, average sales price, historical inventory, historical days on market, etc. Also, I need it granular enough that I'm pulling data for individual zip codes. 

I know most people's response is probably going to be "use your agent to pull data for you from the MLS". That doesn't really work because I need the data across multiple states and I can't waste time asking agents every time I want to analyze a new city for potential investment. The next likely choice would be one of the third party sites (i.e. Zillow, Truilia, Realtor.com). Although these sites do have some great historical data, almost none of their metrics go back far enough. Most of their data only goes back to post crash (i.e. 2012 and after). After searching these sites, I have moved on to speaking with data companies like ATTOM and CoreLogic, but they don't really seem to offer a platform for researching historical data, and buying bulk data is expensive and hard to process in such mass quantities.

If anyone has dealt with this problem before and has a solution I would REALLY appreciate the help! Whenever I run out of ideas the BiggerPockets community is usually the best place to turn!