This research focuses on the investigation and diagnosis of the structural condition of the Parish House in Broumov, a Baroque-era building in the Czech Republic. The structure incorporates elements from three construction phases, including a 14th-century section containing valuable frescoes, making its preservation critically important. The thesis aimed to understand the causes of deterioration, particularly the extensive cracking patterns observed on the interior bearing walls. To facilitate this, a comprehensive 3D digital model was created using photogrammetric techniques based on data collected during limited site visits. The interactive model not only provided access to geometric data but also enabled remote assessment of decay through annotated damage tags. A 2D model of the most damaged wall was then extracted and analyzed using FEM software. Given the lack of direct data on material properties and soil conditions, assumptions were made using literature values and expert insight. Two hypotheses—ground settlement and freeze-thaw cycles—were tested through nonlinear simulations. Although the exact crack patterns could not be fully reproduced, the analysis suggested ground settlement as the most likely primary cause. The findings emphasize the potential of digital modeling combined with FEM analysis for the structural assessment of historic buildings, while also highlighting the need for more comprehensive testing and monitoring strategies.