Members of the Knesset enjoy immunity under the Law of the Knesset, the Knesset square and the Knesset security. The immunity is intended to protect the activity of a Member of Knesset from powerful people who might try to control their steps. This stems from the desire to separate the authorities and prevent government involvement in it. The separation of powers, it must be remembered, is one of the most significant democratic principles.
In a competition held for the planning of the complex, the plan was presented by architect Joseph Klarvin. At that time, the state treasury was almost empty and therefore the cost of construction was financed from the 1.25 million euros that Baron James de Rothschild had donated to the State of Israel at the time of his death. A synagogue lamp and the central ceremonies were placed in the doorway of the complex. In the building of the complex are the plenum, the conference rooms, the Chagall lounge for receptions, a library, an archive, offices and an auditorium.
The planning process was extended and included other architects, among the most important in the young State of Israel, among them architects Dov Carmi and his son Ram. Dora Gad designed the interior of the Knesset building.
On October 14, 1958, the cornerstone was laid in the presence of President Yitzhak Ben Zvi. The widow of the donor, Baroness Rothschild, also participated in the moving ceremony.
The building was inaugurated on August 30, 1966, but over the years it turned out that it could not keep pace with the daily needs of the Knesset. Over the years new departments were added to the complex, and other departments expanded. The complex became small and cramped, and in the 1990's even caravans were installed nearby for additional space. At the beginning of the 21st century, construction of new sections of the complex began, a project that ended in 2007. Today's complex reaches a built-up area three times the size of the original one of 1966. During the expansion, the gates of Palombo were relocated until 2007.