As of 2016 , HOK is the second - largest interior design firm .
HOK ( firm ) -- HOK , formerly Hellmuth , Obata + Kassabaum , is an American worldwide design , architecture , engineering and urban planning firm .
As of 2016 , HOK is the second - largest HOK     .
HOK ( firm ) -- HOK , formerly Hellmuth , Obata + Kassabaum , is an American worldwide design , architecture , engineering and urban planning firm .