Extended closing and on terms that their P&S agreement had to be sent to me before signing extension. 

Does that mean they can pull out of the sale agreement?

If the agent wows you and you feel comfortable working with them, go ahead and sign any agreement the agent wants you to sign for representation. 

The info you received from title and the closing agent is likely because your purchase agreement stipulates cash and no financing.

Review their management agreement.

I know a purchase agreement is needed that secures me the right to purchase the property and reserves me the right to assign the contract but is that it?

First check with your bank, then banks and credit unions, but, they will want an appraisal on the property most likely along with your first born.There are note buyers who will buy a portion of your note, like 4 years worth at a discount, you would need to shop them.It would be easier to sell the note in whole or in part with a repurchase agreement at a later date.

This is about 1/2 way through a 10 year agreement.

Do title companies make purchase seller agreement contracts

Can someone share experiences how a court looks at Sub To agreements?