Joze Plecnik designed the plans for a new royal summer residence which was to be built in the immediate vicinity of the villa by appointment of the Yugoslav King Alexander. He planned a building which was never finished. He named it the New Royal Castle and it exist only as a torso design on which rests Vinko Glanz tea room, constructed in 1940s.
Plecnik was projecting the villa for king Alexander, which was killed in an assassination in 1934. The royal widow decided to abandon the project of Plecnik's castle in 1936. Stone pillars had been built by the outbreak of the war. After the war they built by the vague plans reception hall, which is today's the Belvedere Pavilion. Yugoslav President Marshal Tito used the pavilion for tea parties and hosted many guests from around the world here.