One Allen Center One Allen Center is a 150,506-square-foot class-A office on the Central Expressway.

ALLEN, TX—Allen is the second-fastest growing city in the metroplex, with a workforce of 1.9 million within a 45-minute drive of Dallas. Allen’s population is approaching 100,000 people with a median household income of $105,600 annually. Some 55% of the residents have a bachelor’s degree or higher, twice the US average, according to the Allen EDC.