The damage is too extensive!
Intelligence center has been marked for cleanup.
The Intelligence Center is a GDI structure staffed by members of the intelligence community, whose tasks include administrating intelligence gathering efforts, coordinating Commando raids and spreading disinformation to hamper the enemy war effort. The structure also exists in a base where special interest are present (such as nuclear warhead storage). These structures cannot be constructed; are not part of the GDI arsenal and are mission specific only. Taking over these structures will result in gaining some intelligence.
There were three intelligence centers in Johannesburg, which LEGION captured during operation "Keys to the Kingdom", where he stole the orbital defence matrix plans. The information gained was essential for Nod to ensure the destruction of the GDSS Philadelphia, without the interference of GDI's A-SAT systems.