Vote to make land public
Right now there is a major problem on some servers of players joining, building something, and never coming back. I think the best way to fix this is by having the server make the land public given the player doesn't log back in within 7 to 14 days (1 or 2 weeks).
At the same time, I think the players should be able to vote to give a player a warning. After they are given this warning, then I think players should be able to vote to make the player's land public.
I know a modded minecraft server, which gives users the possibility to buy owned land, if the owner was not online for the last 2-3 Weeks.
I think this would be a nice solution.