People who have Banksy's work painted on their property are fortunate, but they will inevitably attract the attention of thieves.
こんにちは!
ご質問ありがとうございます。
ご質問について、は、この場合は inevitable や、inevitably を使って表現できます。例えば、
People who have Banksy's work painted on their property are fortunate, but it's inevitable that they will attract the attention of thieves.
または、
People who have Banksy's work painted on their property are fortunate, but they will inevitably attract the attention of thieves.
とすると、『品を描かれた人は、幸運だが泥棒に目を付けられることは[避けられない](https://eikaiwa.dmm.com/uknow/questions/55611/)』と言えます。
参考になれば幸いです。