in the past i've picked up entire guild halls with everything inside, and re=placed elsewehre without a single thing moving. However, that doestn work with yards so you must stil lsave, and im not 100% sure if the closet stuff was included in that move or not. Kinda pissed off my old guild many years ago by doing exactly that. I bought the neighbohood and hall with my cash, the leader became a royal douche (ok, he always was but whatever) when i left guild, i took the hall with me. That is likely why, now that its like 10 years later lol, the hall can now only be moved by the leader, however...i think it's stupid because the person that paid for it should own it. the neighborhoods are already surrendered automatically. If someone wants to buy their guild a neighborhood and hall and they WANT the leader to own it, they can give the hall package to them. they are tradeable(afaik only when they come with a neighborhood)
Anyway, i have numerous other alt halls that i've picked up and shuffled around, with contents intact, before this patch that changed things, but the contents did continue to act as they did a decade ago, and stay put regardless of owner and tradestatus. Cant guarantee it hasnt changed with the ownership, but I doubt it. that may be your best bet. save the full layout, then pick up the entire hall and put in inventory, if others can pack up the rest of the contents (idk how that now works) have someoen do that so the new plot can be purchased since i dont think yo ucan have a crate and a hall that are not empty in yoru posession together but i could be wrong. This all depends how important the yard is. many dont have nearly the effort or stuff there as inside. once the hall is placed on the new plot, can continue the unpack process etc