We had a similar situation in our plan but the sign was on the nature strip. After the sale & after what we deemed as a reasonable amount of time, one of our owners – a big burly guy – removed it & took it into the real estate agent’s office & left it there – he didn’t say a word to them when he dropped it off – it was classic – the agent did not say a word either & there were no repercussions, although I should mention the big guy was already not impressed with the agent as the agent had lied to him about certain things when he purchased his unit.