1001 Fannin, a work place for over 2,500 people, is a 49 story parallelogram set diagonally on the block bound by Fannin, McKinney, San Jacinto and Lamar Street (Block 135, S.S.B.B., Houston, Texas).

The first 47 floors contain approximately 1,278,867 square feet of office area; Floor 48 & 49 contain approximately 26,331 square feet of storage area; the ground floor and the mall level (part of the downtown Houston pedestrian tunnel system) contain approximately 28,014 square feet of retail space.