You can use the command to buy it back yourself without an admins help.
The command is egs:buyback:ID
ID would be replaced with the structures ID. Structure ID can be gotten in-game by typing “di” into the console without the quotes. A box will pop up at the top of your screen. Just look at the structure and at the bottom of that new box will be the ID #.
This is the problem, the structure is gone, so I can not look at it to get the ID and I can not find it in the registry, i lost it only about 10 min after I got it so it might not have registered yet.