SELECT t.territory,
 st_expand(t.bbox, ((st_ymax((t.bbox)) - st_ymin((t.bbox))) * (0.1))) AS geom
FROM
 (SELECT
   parcellayer.id,
   st_envelope(st_union(parcellayer.geom,
    (SELECT pointlayer.geom FROM pointlayer LIMIT 1))
   ) AS bbox
 FROM parcellayer) t;