Both the buildings are designed by the hungarian architect Körössy Albert Kálmán.
He was born in 1869 in the city of Szeged. He accomplished his studies in Budapest and in Paris at the École des Beaux Arts. In 1891 he completed his formation in München, under the supervision of the german architect Friedrich von Thiersch.
Returning finally in Budapest he worked together with, maybe, the most famous hungarian architect of its own time, Lechner Ödön. Eventually, he designed, in 1898, the buildings at number 26 of Munkácsy Mihály utca, wich since 1909 until now is home of the famous Kölcsey Ferenc Gimnázium. In this building is evident the influence of the Lechner’s style, specially in the curve lines on the top of the facade, really close to other Lechner’s works in Budapest such as the villa building in Hermina ut.
Following are some famous Lechner’s buildings in Budapest. From left: the Postal Palace, a detail of the same, and the villa at the Hermina ut 47.
The architectural style of Körössy is characterized by the reprisal of historic style reinterpreted through the quest for a national hungarian style (following the guidelines of Lechner of a quest for the hungarian spirit in architecture and figurative arts in general) combined with an accent of modernism.
The Sonnenberg villa combined together all those elements with, too, the influences of the floral viennese style, of the smooth lines of the belgian art nouveau, and of the dramatic and symbolic female figure typical also of the german Jugendstil of München.