They needed to get out of those decrepit facilities downtown on Bell Street.
One thing Texas does very well is plan ahead for highways. The Grand Parkway will help reduce traffic congestion on many other highways.
From another tarticle I found this bit:
Exxon Mobil Corp. is transferring about 2,000 workers from out of state. Most of
those employees will come from the company’s offices in Fairfax, Va. About 8,000
are being consolidated from Houston-area buildings.