Guyana's Parliament Building, designed by Joseph Hadfield, was built on a foundation of greenheart logs. The foundation stone was laid in 1829 and, in April 1834, the structure, stuccoed to resemble stone blocks, was completed. The walls of the Parliament Chamber are paneled with mahogany. Floor length shuttered windows allow light and air to enter, and north-facing windows have small balconies. The floor is made of local greenheart wood.