Joseph F. answered 03/16/25
Masters Student with 2+ Years of Tutoring Exp. in European History.
Sofia was 'demolished' due to the achievement of partial autonomy from the Ottoman Empire, which by that point was a largely dying empire. The "oriental" architecture from the Ottoman period was seen as a hangover from their old occupier. Thus, there was a project to not only modernize the city, but to "Europeanize" it. This is according to a few sources I could locate, such as: 'Capital Cities in the Aftermath of Empires: Planning in Central and Southeastern Europe. United Kingdom: Taylor & Francis, 2009. 94-5' and 'Dogo, Marco. The Jews and the Nation-States of Southeastern Europe from the 19th Century to the Great Depression: Combining Viewpoints on a Controversial Story. United Kingdom: Cambridge Scholars Publishing, 2016. 86.'
Neither source claims that the entirety of the city was demolished, but that portions were selectively destroyed and rebuilt in accordance with a city-plan produced by Czech architect Adolf Václav Kolár. This plan was never fully put into place, however.
A similar example from the West would be my hometown of Chicago. In 1871 much of the city was destroyed in a fire. This gave urban developers and architects the ability to rebuild the city in a more organized and visually pleasing way. It is often claimed, especially by tour guides, that it was rebuilt in accordance with Daniel Burnham's Plan of Chicago, but this wasn't released until 1909. That plan was, like the plan of Sofia, never fully enacted, but much of it is visible in the city today.
I would be weary, just across the board, of any claim that an entire city was demolished and rebuilt, unless destroyed by war or natural disaster. Rebuilding an entire city is a monstrous expense that is rarely undertaken unless absolutely necessary. It would instead appear that portions of Sofia were demolished and rebuilt, notably those that displayed Ottoman architecture.
I am, however, not a Bulgarian speaker and primary sources in the language would be necessary to make a more definitive statement.