accommodation, building and window cleaning services. cleaning services. with around 18,000 students and over 2,000 employees, the university of siegen is an innovative and interdisciplinary university. with this procedure, the client awards the cleaning services at the adolf-reichwein-strasse campus in siegen-weidenau. the order is divided into three large lots according to buildings. these lots are divided into subject lots according to maintenance and glass cleaning. the background to the chosen division is that the university of siegen is currently and will be in the near future in a sustainable restructuring process, which affects the majority of the locations intensively. the maintenance and glass cleaning services for lot 1 have already been awarded. with this award procedure, the services for lot 2 a - maintenance cleaning and lot 2 b - glass and cleaning are awarded. it affects the buildings on the adolf-reichwein-strasse campus.