Operation of an engineering firm for the planning of building services, preparation of energy, ecological and building physics studies for buildings of all kinds, consultations and planning for drinking water and gas supplies in the public and private sectors, consultations in the field of energy, building and building services technology, construction and maintenance of buildings of all kinds as well as acquisition, sale and trade of building services components; may acquire, establish, manage and dispose of real estate, companies, intellectual property rights and securities domestically and abroad within the framework of the law.