The edifice as it is today owes its form to the work of architects Petko Momchilov and Friedrich Grunanger, who began work in 1904. The mineral baths opened in 1908 and were fed by underground springs. Neglected in the 1980s, the edifice was closed for a time before being gradually restored. Since 2015, the building, with its stylish façade, is the venue of the Museum of the History of Sofia.