Sydney's iconic Sirius building will get a second chance at a heritage listing after the Land and Environment Court ruled the NSW government made legal errors when it chose not to protect it.

Acting Justice Simon Molesworth, delivering his verdict on Tuesday, said then-heritage minister Mark Speakman had not properly considered a recommendation by the Heritage Council to list Sirius on the register in 2016. The minister decided against registering the building at The Rocks because it would cause “undue financial hardship” for…