A 15-per-cent tax on foreign homebuyers in Metro Vancouver is unconstitutional and unfairly discriminates against people from Asia, a proposed class-action lawsuit against the British Columbia government argues. An amended document filed in B.C. Supreme Court last week argues the so-called foreign-buyers’ tax is unconstitutional because it violates equality rights by making an “arbitrary” distinction between those who are citizens and permanent residents of Canada and those who are not.