We have created a project for the interior design and furnishing of the city library building at Ulica Kamila Firingera 3, Osijek. The reconstruction of the building achieved nearly zero energy standards (nZEB), with the installation of quality ventilation and lighting for a comfortable stay. Sustainable and durable materials were selected for floor and wall coverings: terrazzo, bio-based vinyl, and acoustic coverings in the offices. The selected furniture has an unobtrusive design, is adaptable and modular for multi-purpose use of the space. Accessibility is ensured by height-adjustable furniture and specialized audiovisual equipment for people with special needs.