I want to thank all those who have provided helpful, constructive responses (in particular red kayak and army judge).
And perhaps I need to clarify. It is not all "junk".
First and foremost, I have a 35 yr old classic Porsche in there. Very easy to prove it's value. Once I knew the place was up for sale, I've been trying to get a part to make it operable again which has been impossible with the parts supply shortage right now. (And just so you know, I've been restoring cars for over 40yrs so I know what I'm doing when it comes to cars. However, legal is not my forte. That's why I'm here). So yes, I can probably get a storage but I can't legally work on cars in storage units. That's why I'm scrambling trying to get this frickin part and get it running. I have already gotten a moving permit for it because it has not been registered in years so I need the special permit to transport it anywhere. And all kinds of other stuff (Thank you California).
And I also have a fully built high performance engine for a different car in there as well. And some Mid century modern furniture. And yes, a few knick knacks. The relative sold her only remaining car years ago and I figured it would be a safe place to keep my car since she has/had a 2 car garage and other people have lots of their stuff in there as well. Other people have dining tables, punching bag, large workbench, boxes of clothes, boxes of tapes, etc.
But when all this BS started, I anticipated some "problems" may arise so I photographed and documented all my belongings in that garage. And it's not like I never go and check on things (and my relative when she was there).
And I also had some antique stuff inside her house that I told her she could enjoy and use as long as she wanted to. Some of that stuff (inside the house) disappeared over the years . But when I would ask her about it, she always said she didn't know what happened to it. I know there were always people going in and out and attribute it to that. So I unfortuneately chalked it up to the cost of keeping my stuff there.
And just in case you think I'm some kind of a**h**, for many years I told her she could sell her place and come live with me if she wanted to in the extra bedroom. She always said she didn't want to live with anyone. And eventually, I came to accept that, since it was her wishes. I just thought she'd be better off with family. But, again, it was her choice.
So... I just figured all this was too much info and would cloud up the issue. That's why I didn't intially write all these long boring details. And, I didn't think it would be relevant to the question at hand.
Like I said, I have every intention of moving out. And I make 1 -3 trips a week and load up the back of my full size SUV with some of my stuff when I can.
I was just looking for some legal advice. I didn't think it would be appropriate to clutter up the initial question with all these details. But maybe this gives everyone here a little more background and perspective.
And again, I thank those who have responded with insightful "legalish" responses for sharing your time, knowledge and experience.
p.s. - I don't think she owes me free storage indefinitely. But I think a little more "heads up"/ advance notice would have been much more appropriate. And greatly appreciated. It would have given me more time to make the proper arrangements. This is not the only thing I have to worry about. I have a lot going on. That's why I initially asked how much time/notice does she needs to give me.