The King's House Gate
Interpreters suggest that seeing the King's house gate change may indicate that one of the King's officials will lose his authority, and the King might marry another woman. The Imam walking on foot signifies keeping his secrets and overcoming his enemies, and the praise of his subjects means victory for him. Scattering sugar or dirhams on him is interpreted as hearing pleasant words, while scattering dinars or throwing stones or arrows may indicate hearing what he dislikes or the subjects' curses against him due to his injustice.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam