Löwy moved to Zagreb, in 1930, where he started working in the architectural studio of Ignjat Fischer. In 1931 in collaboration with Vlado Antolić, Löwy starts a tender for the city Savings Bank project in Sarajevo. That same year he moved into the architectural studio of Stanko Kliske. Löwy became a licensed architect in 1931, and that same year he established his own architectural studio, „Löwy“. That same year he performed his first self-derived house in Petrić street 7, at the space of the former Zagreb Trust block. He married his wife Terezija Rakić in 1932, and on November 8, 1933 Löwy son Miroslav was born.