| Relationships | Role | Relationship Start | Relationship End |
| Bt Building Corporation | Parent | 1/1/1990 | 12/10/1997 |
| Bt Building Corporation | Parent | 11/30/1987 | 12/31/1989 |
| Rbt Associates | Parent | 1/2/1986 | 11/30/1987 |
| Bt Building Corporation | Parent | 1/2/1986 | 11/29/1987 |