$args = array(
                                 'post_type'         => 'mad_property',
                                 'post_status'       => 'publish',
                                 'paged'             => '-1',
                                                       'meta_query'  => array(
        array(
            'key' => 'seasonaldiscountdesc',
            'value' =>'',
        'compare' => '='
        )
    )
                                                       );