Is this a single family, duplex or is this an apartment complex?

This is way too complex for an off-the-shelf/online partnership agreement.  

We are purchasing an apartment complex that the owner is unable to sell for another 18 months due to a defeasance clause in the mortgage.

First, Title 3 raises allowing unaccredited investors are going to be quite expensive and won't make sense for most smaller projects - so staying intrastate is faster/less complex/cheaper off the bat.Second, one of the most important things about equity crowdfunding is risk mitigation.

I also invest full time in larger apartment complexes.

My interest right now is in mult and/or apartment complexes.  

Would you be at all interested in a 200+ unit complex in IL?

From the steps that I have taken I would recommend listening to as many podcasts as you can: https://www.biggerpockets.com/podcastI have stuck towards reading blog posts and personal stories, as I generally learn more from reading someones experiences than straight facts.And tonight I actually purchased my first complex valuation which gives me the selling price for the last 10 units in the complex, all the unit owners etc...Get your knowledge up to scratch and then you will start to feel more comfortable when looking to purchase your first property. 

My main interest is to own an entire apartment complex of anywhere from 10-40 units.

My guess is that besides the complexity and unrecoverable cost of underpinning, that as Brian mentioned, egress, may be the deal breaker.