The house and garden of the Union or the house of Amin al-Sultan is a mansion belonging to the Qajar period, which is located in the center of Tehran and is known as the only surviving part of the old Lalehzar Street and one of the most valuable architectures of the Qajar period. Due to its location between Ferdowsi Street and Lalehzar Street in old Tehran, this house was also a place for foreign guests to come and go in the days before the revolution and for political meetings.