It's great that you found a seller willing to accept seller financing now just cover your bases.

In order to accept you as a TIC there must have been some relationship with the lender that allows them to carve out that % interest. 

Do I need to accept the date that is most convenient for them and not me.

Accountants are in such demand, that the best are not even accepting clients half the time.The other problem I see often with accountants on here is that they specialize in larger investors, and have really high prices when you as a smaller investor do not need all the bells and whistles.Another thing I see is folks thinking they need to have a tax professional in their state.

I would suggest NOT to buy the property if the tenant is not accepting CASH FOR KEYS

How did you find a landlord willing to accept this arrangement? 

You have to be ready to accept the risk and see if its worth the benefit every time you make any decision about investing.

Now I look at public records myself and get title searches done after a bid is accepted.

In my experience the odds of a seller accepting a lease options goes up as the property condition goes down.

They don't have to accept a title transfer back, if you read the Due on Sale clause.