sentences:  Some 15 youth brigades, with 18,000 people, were employed at the construction site but the works ceased in November 1950.After the idea of the congress center was abandoned, architect Dragiša Brašovan revised the plans and adapted the structure as the highrise hotel.Construction works were continued in 1954 and, though they were finalized in 1958, the hotel was opened for guests on 20 August 1957.