| OKALUX+
"Mittelland" sports hall Barleben
| OKATECH
Erasmus University
| OKAWOOD
University of Technology and Economics
| OKALUX K
Institute for Textil - RWTH
| OKATECH, OKATHERM
Office Building Biskupská
| OKAWOOD
The Cubes of Zürich
| OKASOLAR W
Bâtiment de services ECA-CEI2
| OKATHERM, KAPILUX W