ARCO (Atlantic Richfield) Oil & Gas was headquartered in the ARCO Tower in downtown Dallas since August of 1983. Designed by architect I.M. Pei, ARCO sold the building in the mid 1990 as recommended by auditors.
Transamerica Real Estate Tax, a division of Transamerica Corporation, moved to Dallas from California in the mid 1990s and occupied several floors in the old Renaissance Tower (with the X on it) which also held the headquarter office of Blockbuster video. Firstamerica Bank was a spin-off of Transamerica due to the Bank Holding Company Act of the 1950s.
International Business Machines (IBM), one of the largest companies in the computer industry, provided the foundation for my software career up to the turn of the millenium and beyond.