When the center was found by Alcatraz, it had been decimated by C.E.L.L. forces, and the E.M.A.T. personnel there had either been slaughtered or had fled. The center consisted of thirteen E.M.A.T. medical screening tents along with decontamination showers, a guard tower, multiple external and internal walls, parking locations for vehicles, an isolated area (probably where carriers of the virus were taken for treatment), and a final processing checkpoint that led into the streets of lower Manhattan.
C.E.L.L. Takeover Edit
Battery Park is the first area where Alcatraz encountered C.E.L.L. operatives. They were immediately hostile, had heavily fortified the center, and began a cleanup operation by burning deceased carcasses (within body-bags) that had been found on the site.