It had thick mud-brick walls on all sides except on the south, and was provided with a complete system of underground water channels which were linked to the subterranean drains of the Hadish and other buildings.
Some have speculated that this building situated on the highest point of the Persepolis platform must have been a "temple ", because according to classical authors, the Persians used to worship their divinities on lofty places, and because a complex of buildings as large as Persepolis could not have been without a place for worship. Others have argued that this area must have been a park. Both theories are proved wrong by a stairway with opposed flights which gave access to the palace from the south.
Just as in the case of other residential palaces, here also the façade was sculptured with two files of antithetic "Persian" guards facing an inscription while its inner walls were ornamented with figures of servants carrying provisions and utensils. The text inscribed on the middle of the facade stated that the staircase was built by Artaxerxes III. Such sculptural ornamentations would not have been suitable for a park or a temple. Following the collapse of the Persian Empire, the staircase was dismantled, and its sculptured blocks were taken to the Tachara courtyard, where they were reused in "Palace H " described above. A much smaller doublereversed staircase on the southeast corner of the "Palace G " led down into the eastern court of the Hadish while a long narrow passage separated the Tripylon and "Palace G ".