"renting unused assets" what an appealing phrase! When I notice I have an asset that I am not using, my first thought is to jettison it. I haven't even reached the stage of selling it or giving it away, I just discard it. Now for big stuff that cannot be thrown away, because they might become a liability for me, selling or gifting is not the only option! Using one or two units as short-term rentals in a large multi-family building might be an option for such property owners to consider. Peace and love.