Perhaps the most important change augmenting Peter's design was the elevation of the Grand Palace to central status and prominence. The Grand Palace was originally called simply 'Upper', and was hardly larger than any of the other structures of the complex. The addition of wings, undertaken between 1745 and 1755, was one of the many projects commissioned from the Italian architect Bartolomeo Rastrelli by Elizabeth of Russia.[18] Likewise, the Grand Cascade was more sparsely decorated when initially built.