SOLVED:
$args = array(
‘showposts’ => 10,
‘post_type’ => ‘propiedades’,
‘meta_query’ => array(
‘relation’ => ‘AND’,
array(
‘key’ => ‘tipo_de_propiedad’,
‘compare’ => ‘LIKE’,
‘value’ => $tipo,
),
array(
‘key’ => ‘tipo_de_operacion’,
‘compare’ => ‘LIKE’,
‘value’ => $operacion,
),
array(
‘key’ => ‘zona’,
‘compare’ => ‘LIKE’,
‘value’ => $busqueda,
)
)
);