A full-time position just hasn’t come my way yet.I recognize that in theory, monthly mortgage payments shouldn’t be an issue since I’ll be househacking, I would just rather comfortably afford the mortgage if everyone somehow decides to move out at one time.

Negatives would be maintenance issues, and need to update space as time goes on to bring in quality tenants and rent.

Or what seems crazy to me.Is it legal to create a 501c3 organization to buy investment properties and rent them out at fair market value?

But unless you know and understand the reasoning behind it, and are sure the reasoning applies to you, opening up all these LLCs because "everybody does that" or "that's what my real estate bible told me to do" is a pretty silly way to run a business.Taxes and, I assume, legal issues, are never cookie cutter, one-size-fits-all issues. 

Often, word-of-mouth referrals are the best way to find someone who not only understands the legal side but is also familiar with the nuances of real estate investing depending on your needs.Additionally, you can use the BiggerPockets network to ask for attorney recommendations in the Forums under the "Real Estate Professionals" category.

Keep in mind that you'll have unique issues with it that WILL have to be addressed at some point if they haven't already...

My CPA said it is legal. 

Once the title is clear of those pesky old liens, you'll be good to go.This is not legal advice, so speak with your attorney for actual procedural issues.Keep investing and moving forward!

If someone could provide me with a little information on how to obtain, or any legal help would be much appreciated.

An LLC is just something you paid 150 dollars on legal zoom to create.