• Located in downtown Atlanta, this mixed-use development consists of a 5-level subterranean parking structure with the 55 Allen and the 45 Allen towers constructed on top – a 14-story office tower and a 28-story hotel/residential tower, respectively.  All structures are constructed with mild reinforced and post-tensioned cast-in-place concrete.
• During design phase of 45 Allen, additional levels were added to the tower. However, since the foundations and subterranean parking structure were already constructed as part of the 55 Allen Plaza project, the load limits were predetermined. To add the additional levels, semi-lightweight concrete was utilized, instead of normal weight concrete, in the top nine floor levels to compensate for the additional load.
• The office tower’s floor-to-ceiling glass facade creates a modern design from the outside and provides tenants with stunning views of downtown Atlanta from the inside.

Award of Excellence
McGraw Hill Construction