Great Southwest Building, Art Deco skyscraper in downtown Houston, United States.

The Great Southwest Building at 1314 Texas Avenue is a 21-floor, 88.7-metre skyscraper on a square footprint. Its facade is brick cladding over a concrete-clad steel frame, set on a granite and limestone base. Art Deco styling carries Mayan reliefs at the base and cornice, and the upper floors step back to echo a Mayan pyramid. A two-storey parking garage was built into the original structure.

Originally constructed between 1926 and 1927 as the Petroleum Building, it was designed by Alfred Bossom and developed by oil industry figure Joseph S. Cullinan during Houston's economic boom period.

The building exemplifies Art Deco architectural style with limestone base, brown brick walls, Mayan relief figures, and glazed terracotta ornaments that reflect the movement's fascination with ancient civilizations and geometric patterns.

Currently operating as the Cambria Hotel Houston Downtown Convention Center, the building offers 226 guest rooms, meeting spaces, and ballrooms on the 20th and 21st floors for business events and conventions.

The Petroleum Building was the first known skyscraper to include a built-in above-ground parking garage in its original construction, a two-story facility. Its stepped-back upper floors, inspired by the pyramids at Tikal, were meant to bring more natural light to street level. The building was listed on the National Register of Historic Places on August 8, 2019.