Plans to demolish Perth's infamously unfinished mansion, dubbed the Taj Mahal on the Swan, will be fought by the owners who still plan to live there one day.

The $70 million doomed eyesore regularly attracts trespassers and has been covered in graffiti since being abandoned by fertiliser magnates Pankaj and Radhika Oswal in 2011. The Shire of Peppermint Grove voted unanimously on Tuesday night to demolish the derelict structure, which had been planned to include a temple, gym,…