At that point the company had not decided which location in Houston would have the headquarters. The company wanted of office space to house 700 employees. Citgo considered the 1500 Louisiana building in Downtown Houston, the Williams Tower in Uptown Houston, the BMC Software headquarters complex in Westchase, and the Aspentech Building in the Energy Corridor. In June of that year the company signed a lease in the five-storey Aspentech building so it could serve as a headquarters. In September 2004 the company began moving its headquarters, and by September 24 Citgo had already relocated 150 employees to the Energy Corridor offices.