Four Allen Center, Office skyscraper in downtown Houston, United States

1400 Smith Street is a 50-floor, 211-metre office tower completed in 1983 to a design by Lloyd Jones Brewer and Associates. Its curved, cylindrical facade is a grid of reflective blue glass panels set between light-coloured mullions, with a band of green-tinted glass near the flat top. A white multi-level parking structure hides the lower floors, and the tower connects to Houston's tunnel system.

Built in 1983 by Lloyd Jones Brewer and Associates, the tower opened as Four Allen Center, part of the Allen Center complex. Enron moved to Houston in 1985 and made it its headquarters, adding a similar tower across the street linked by a circular skywalk. Brookfield Properties bought it in 2006 for $120 million as Chevron leased the whole building; Chevron bought it in June 2011 for $340 million.

The building connects to Houston's underground pedestrian tunnel system, showing how the city manages intense Texas heat through smart urban design. This network lets people move through downtown without stepping outside.

The building sits in the central business district with easy access to public transportation and nearby amenities. Visitors will find the underground tunnels particularly helpful on hot days.

Before Enron's 2001 collapse, the company built a second, similar tower across the street and linked it to 1400 Smith Street with a circular skywalk. The two buildings formed a paired complex, and the skywalk crossing Smith Street was the visible sign of that link.