Mulleti would return in Albania only after Zog's exile and the Italian invasion in April 1939. He was elected Mayor of Tirana (1939–1940). Certain well-known architectural objects in Tirana were initiation or given life while he was in office, i.e. Hotel Dajti, today's National Archeological Museum building, Academy of Arts building, Council of Ministers building (), etc. In 1941 got nominated Special Emissary for the Liberation of Albanian Territories of Kosovo and Debar area. In 1942, he became acting prefect of Tirana.