Human psychology is an amazing thing, really. 

My bachelor's is in psychology, my masters is in exercise science, and my current business is a small e-commerce business selling wellness products, but I want to learn BRRR!

On a serious note, if you truly believe that please, seriously, seek immediate psychological help, seriously.  

It was an emotional /psychological decision, not a financial one.

A lease locks you in for the term but you have almost no protection if someone breaks a lease so 1 year is all I will do, a year psychologically tells them they have to make a decision in a year.

At minimum, read some on property underwriting, management, business ethics, marketing, and psychology.

But I'd say I've learned over the years that it is far more psychology than I realized.

I have been reading and tuned in to the podcast and currently trying to build my team and work on my psychology.

It may net the seller no different than your preferred offer, but psychologically they got what they wanted (full price). 

In the spirit of getting you to the finish line and cleaving off more properties from this "awesome lady's" portfolio in the future, below are some unconventional negotiation and behavioral psychology suggestions on how to manage the 'elderly man' tenant, and maybe other comparable situations in the future?