> You mean seizure of land? That's quite a risky thing to do. Not really, it happens all the time, see eminent domain and adverse possession, etc. It's genera

> You mean seizure of land? That's quite a risky thing to do. Not really, it happens all the time, see eminent domain and adverse possession, etc. It's generally viewed as against public policy for land to be left unused. Perhaps they could assess special, onerous taxes on property without a clear owner, and require said owner(s) identify themselves clearly when they're paid. If they don't, the property could be seized to pay the taxes.