Banned protection stones

[uberratchet]

My friend that i was sharing my house with got banned for greifing and he owned half the house with protection stones. Now I can't expand my house at all cause he owns about half of it  Is there any way to get rid of them? His account name is Beezie123z so you can check that he was banned

[ryans1230]

Do /helpop <reason> in the serverto have a mod help.