But , as Britain faces a housing shortage and soaring property prices , The Bishops Avenue 's empty mansions are likely to add to debate over taxes payable by overseas property buyers -- particularly if they remain empty . A third of the houses on London 's second most expensive street are lying vacant . On ` ` Billionaires ' Row , '' the road 's average house costs over £ 6 ##m . Many have been demolished by their wealthy foreign owners .
A third of the houses on London 's second most expensive street are lying vacant . On ` ` Billionaires ' Row , '' the road 's average house costs over £ 6 ##m . Many have been demolished by their wealthy foreign owners .