Thank you for the kind offer, but my submarines are gone already. The plots will get demolished when auto-demo is turned back on and if I get lucky with the timing maybe I will receive some gil for those when the next callback campaign happens. And someone else will get lucky in the lottery. I've given up houses before and each time I've bought one or spent days decorating it I did so with the understanding that one day I would need to let it go.
I also considered giving the subs away, but in the end I didn't want to contribute to SE getting another guaranteed subscription from a new housing hostage or for a fellow player to feel like they are compelled to keep playing because of something I made. I kept my fleet going for almost two years because I really liked building it from scratch and being rewarded for it, but when the game as a whole stopped being enjoyable it became a chore to click through the menus every day. I would look at the game on my pc desktop and not want to log in even for the free gil, and yet I was always keeping a mental record of the demolition timer. It's a relief to not have to deal with it anymore.