The report contains brief historical information as well as structural description of the building. Results of the detailed inspection and structural state assessment of external and internal walls, floors and roof frame are given. These results were assumed as the basis for rehabilitation works to secure further safe operation of the building. The authors give their technical solution for strengthening of external brick walls and attic space with the help of micro-cement and epoxy injections. A repair option is described to strengthen the brickwork near the roof tension bars with low-viscosity epoxy injections and subsequent application of cement-based repair mortar and gluing carbon-fiber sheets. They also introduce their design of roof and attic load-distribution system consisting of cross-beams and steel tension bars as well as propose their solutions for strengthening brick vaults and columns in the basement with CFRP materials.