It is described as very large – three stories high, with row upon row of windows ornamented with real gold. It stands above a series of marble terraces, crowded with statues and golden fountains. There is a huge double-eagle fountain located at its base.
When Alina is first brought to Os Alta, Alina notes the grandeur of the palace grounds, and that the palace itself is larger than any building she had ever seen, but otherwise does not seem particularly impressed by it. The Darkling remarks that it is "the ugliest building" he has ever seen.
Although it is an extravagant demonstration of wealth, the Darkling did not think highly of the palace. It was partially destroyed during the Darkling's attack on Os Alta.
When Alina uses her connection to the Darkling to visit him through astral projection, she sees him in the throne room of the Grand Palace.