I’m in full agreement with everything you wrote.

Because when the seller realizes he or she is not going to have to pay 6% of the purchase price to an agent I can negotiate a lower price and the seller is more likely to agree.The process was simple with the guidance of a good real estate attorney.This can be accomplished only if the property is not under a current listing agreement. 

Cost could change but the bigger issue is making sure the usage is still eligible for the type of policy you have.As an example, at the time of application, a company might ask are all lease agreements for one year or longer. 

Partnering with others can help you grow, but it’s important to have clear financial agreements in place to avoid any issues down the road.

I had not signed any agreement authorizing management services for the property. 

Definitely hire a real estate attorney to draft or review any seller financing agreement to protect your interests.Ask the real estate attorney how to handle the POA situation...can you talk with any of the other property owners who are short term renting out their properties to see what/if they have any issues? 

Chances you can get a company to do title, pay cash and come to an agreement within a week is going to be very challenging.

Review their management agreement.

I renegotiated a Lease with my first property a few months back and pretty much stuck to the same terms as the prior lease agreement (minus rent increases). 

The process and timeline can vary by state, so make sure to check your lease agreement and local property codes for specifics.