In 1970 the M. W. Kellogg company had moved its headquarters from New York to Houston. After Kellogg moved its operations into Greenway Plaza, initially Kellogg occupied half of 3 Greenway Plaza and staffed the half with fewer than 600 employees. When the energy industry expanded worldwide, Kellogg occupied all of 3 Greenway Plaza and space in an adjacent building. Kellogg's lease on July 1, 1991 was up for renewal; if Kellogg had renewed the lease, its rent payment would have increased. Instead Kellogg decided to swap office space with its parent company, Dresser Industries. Dresser took over a part of Kellogg's lease and renamed 3 Greenway Plaza to the Dresser Tower. After the swap Dresser occupied of space on eight floors, while Kellogg continued to lease six floors in the building. In exchange Kellogg took space formerly held by Dresser at the M. W. Kellogg Tower in the Cullen Center in Downtown Houston. The swap satisfied Dresser's need for less space.