That's why a lot of sanctions go against oligarchs in a person. It is more discriminate and does not matter what kind of property they have.
For example, oligarchs Italian villas
https://www.icij.org/investigations/pandora-papers/uk-target...
The rationale is that you cannot do both support a dictator and plunder your own people, and then enjoy the benefits of European lifestyle without European rule of law based justice.