Claim: Transocean and Occidental Petroleum Parker Drilling are tenants of Four Greenway Plaza which opened in 1975; while the branch office of Boardwalk Pipeline Partners and Humana Mitsui Oil Exploration is located in Nine Greenway Plaza.
Evidence: Nine Greenway Plaza 1978 Boardwalk Pipeline Partners (HQ)
Humana
Mitsui Oil Exploration (HQ)