From Halopedia, the Halo wiki
In October, 2552, during the Battle of Earth, Mombasa was abandoned and Franchbot Industries appears to have been locked up. The area in front of it, however, was the site of intense fighting between Marines of A Company and Covenant Wraith tanks, eventually culminating when the Master Chief and a Scarab arrived in the area. The building was not harmed, but it is presumed it was later destroyed anyway when the city was glassed by the Covenant in order to uncover the Forerunner portal generator buried under it.
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