Claim: Transocean and Occidental Petroleum Parker Drilling are tenants of Four Greenway Plaza which opened in 1975; while the headquarters of Boardwalk Pipeline Partners and Humana Mitsui Oil Exploration is located in Nine Greenway Plaza.
Evidence: Four Greenway Plaza 1975 Transocean
Occidental Petroleum
Parker Drilling Nine Greenway Plaza Boardwalk Pipeline Partners (HQ)
Humana
Mitsui Oil Exploration (HQ)