The Architectural Record recently released its annual list of the top 300 architecture firms nationally, which includes six firms that are members of the American Institute of Architects Iowa Chapter: DLR Group, ranked 21st; Heery International Inc., ranked 60th; RDG Planning and Design, ranked 98th; OPN Architects Inc., ranked 109th; InVision architecture planning and design, ranked 205th; and Shive-Hattery Architecture-Engineering, ranked 279th. Companies were ranked by revenue for architectural services performed in 2014. Data were collected by McGraw Hill Construction’s Research and Analytics group.