My landlady said the idea of being an equity partner was interesting, and she was not against it! We gave me the task of finding a real estate lawyer who would be willing to help craft a document to set all the expectations, and she's got an assignment too, and so we move to the next step!
Thank you, everyone, for your good thoughts. Especially you, Belly. You were brave enough to wish me luck in my comments. Thanks!
So, I just want to acknowledge my landlady for being willing to explore a flexible option. I am very grateful for her generous spirit.