If you need to hide the checkbox if any option of the Tenancy
group is selected, you have to do like this:
$('.QuickSearchProperties').on('change', function(){
if($(this).find("option:selected").attr("optGroup") == "Tenancy"){
$('.ExcTen').addClass('hide');
} else {
$('.ExcTen').removeClass('hide');
}
});
Check the Demo Fiddle