Find the name of the movie

Hello, help me find the name of the movie. It's an almost scary movie where a woman architect is sent to find information about the destruction of a building with the help of an explosion from the maps and measurements. It's an old building and some poor people live in it, but after that The lady discovers terrible secrets, such as the fact that a mother and her son imprisoned the main designer of the building for years inside the building itself. At the end of the movie, the building is evacuated and explodes.