I'm not sure if where your rental is but the entire city is in demand due to enormous growth that is just getting stronger.  

You'd have a much stronger case if she pulled this twice in a row, especially if the previous manager tries to accept a second payment. 

Now you have almost a brand new house, stronger rent growth market, and items to repair or replace should be few and far between in first ten years.In this example your return could be 50k to 75k equity plus cash flow versus the old house that is a big money pit.        

Say from where we are now- rates will go up if the economy gets stronger or if inflation starts in.

Yours might be a stronger SFH market so you must adapt.  

In this case, I don´t expect there to be much competition for the property, and I´m hoping that that makes our case a bit stronger for negotiation with the seller.

It is much stronger than what I have in there now.

Written documentation is much stronger than verbal conversations.

Of course a combination between Margin loans and IUL policies would give you an even stronger position of leverage. 

Strategies do not even have to make money, but need to help our residents live stronger, fuller lives.