The paper consists of two parts. The first part – an introduction based on the theoretical foundations of durability, condition assessment, and rehabilitation of reinforced concrete and masonry structures. The second part – refers to the analysis of the high school dormitory building and contains the following: a technical description of the structure, a condition n assessment of the building (with photos and indicated damages and defects) based on a visual inspection, and a proposal for rehabilitation measures that should be implemented. The proposed rehabilitation measures are aimed at bringing the structure into proper condition and extending the service life of the high school dormitory structure.