| Relationships | Role | Relationship Start | Relationship End |
| Francommerz Vermogensverwaltungsgessellschaft Mbh | Parent | 12/31/1986 | 8/31/2001 |
| Hochtief Inc. | Subsidary | 12/31/1980 | 8/31/2001 |
| Philipp Holzmann Aktiengesellschaft | Subsidary | 1/1/1996 | 12/18/1998 |
| Ht Construction, Inc. | Subsidary | 12/31/1987 | 9/21/1988 |