This thesis aims to present a developed methodology for analyzing and adapting the socialist-modernist heritage, with case stydy example of dissonant abandoned building "Bankya Residence". This is a long-forgotten architectural masterpiece from Bulgaria's socialist era. The overall study focuses on Bulgaria's contemporary problems regarding architectural heritage, which often becomes the subject of political debates that tear society apart, leading in turn to the destruction of famous cultural sites. The analysis presented strives to be objective and neutrally political. Washing away the "red mark" shows the essence of these buildings and their true architectural values. The aim is to distinguish a unique socialist modernist architecture from the mass residential buildings that Eastern Europe is known for, opening the broad topic of the potential of these unique buildings and their adaptation in modern cities.