Running a business comes with paying taxes and I will work with my CPA to write-off/depreciate whatever I legally can as a business owner.I see a bunch of discussion around "substantial services".

Hi Chris, I presume getting an attorney is the best option especially since some legal action of some kind will be needed.

Can we avoid any legal litigation here?

Can parents legally force me to attend a university?

The money isn't legally yours until it's earned, which is every month when rent is charged.

. --- If you close on the property in November and immediately send the 30-Day, you LEGALLY have to wait until January 1 to file a landlord-tenant case to regain possession is the tenants have not vacated.4) Your rent losses will be November, December, January, February and probably March if the tenants choose not to pay and you have to evict.--- Make sure seller at least collects & prorates November rent to you!

They will ask you a lot of questions about how things will be structured within the group and write up your legal docs. 

Your question is a legal question, so seek legal advice.

Is it even legal to charge a broker's fee to a buyer that you are not representing as a listing broker?

It checks all the boxes to be legal - 2 egresses, windows, 7' ceilings, bathroom, full kitchen, etc.