We decided to distribute profits as 70% for me, and 15% each for the agent and the contractor. - Do I need to setup an single member LLC?

Of course this advice is totally useless if you decide to physically move out of state ;-)

These can be big ticket special assessments once the HOA decides to deal with them.

I have decided to do short term rentals of my home in baltimore to travel nurses and other traveling professionals.

They should be determined first and then whether to refinance or not would best be decided by which way moves you closer to your goals faster.

She has decided to move back in and refuses to sell.

When you do decide to move again, for what ever reason, it will be easier to sell and better price. 1 Bed/1 Bath houses just dont have that much demand...maybe Allen, TX is different IDK. 

Last year, I decided to list the duplex for sale and I learned that my deed's legal description was incorrect once I had the property under contract.

I ran into this issue quite a bit as an investor, so I decided to become my own agent.

I have recently decided to use my  401K after much reading so I have not reviewed what other investment options I have available to me.