SQL> SELECT name,
  2  	    total_size,
  3  	    NVL(property_value, 'UNLIMITED') AS "MAX_SIZE"
  4  FROM v$containers c, cdb_properties p
  5  WHERE p.con_id(+) = c.con_id
  6  AND p.property_name(+) = 'MAX_PDB_STORAGE'
  7  /

NAME			       TOTAL_SIZE MAX_SIZE
------------------------------ ---------- --------------------
FUDDB				288358400 1073741824
PDBORCL 				0 UNLIMITED
CDB$ROOT			977272832 UNLIMITED
PDB$SEED			283115520 UNLIMITED