The House of Representatives is the lower chamber of the bicameral legislative branch of Liberia, and together with the Senate comprises the Legislature of Liberia. The number of seats is fixed by law at 73, with each county being apportioned a number of seats based on its percentage of the national population. House members represent single-member districts within the counties drawn up by the National Elections Commission and serve six-year terms. The House meets at the Capitol Building in Monrovia. The primary purpose of the House is to pass bills in conjunction with the Senate so that they may be sent to the president for signature or veto. The House also holds the exclusive right to introduce revenue bills into the Legislature, as well as to impeach the president, the vice president and judges upon the concurrence of two-thirds of its members. The House is led by the Speaker of the House, elected at the beginning of each new legislature from among its members. Article 30 of the Constitution sets four requirements for members of the House: 1) they must possess Liberian citizenship, 2) must be at least twenty-five years old, 3) must have been domiciled in the district which they represent for at least one year prior to their election, and 4) must be a taxpayer. Under the 1847 Constitution, House members were required to own a certain value of real estate within their district, which in effect limited the ability of indigenous citizens to be elected to the House. Property ownership as a requirement for election was eliminated in the current Constitution. Seats in the House are apportioned among the counties of Liberia in proportion to their percentage of the population according to the national census, with each county being guaranteed a minimum of two seats. Article 80(d) of the Constitution states, "Each constituency shall have an approximately equal population of 20,000, or such number of citizens as the legislature shall prescribe in keeping with population growth.