User blog comment:B214/Talk About What You Want! 2/@comment-74.77.52.225-20140801025045/@comment-1359322-20140815080210

Just so you know, the Gremory land doesn't and won't belong to Issei. It's the Gremory's territory meaning it's not even Rias' territory. Being clan head is like being in charged of the territory only, they don't own it. The land belongs to the family not any individual.