At the beginning of the 20th century, the Chamber of Commerce purchased a neo-Renaissance building constructed in 1884. After World War I, it took the decision to add another floor to the building and redesign its interior. Between 1925 and 1927, the architect Jože Plečnik in collaboration with France Tomažič designed one of Ljubljana's most original interiors, inspired by exotic ancient Egyptian, Etruscan and Minoan motifs. The interior of the building can be viewed by appointment. The Constitutional Court building's staircase is covered in slabs of black Podpeč marble and decorated with magnificent columns. The inner entrance doors differ from one another in height and shape as each of them was specially designed. Most of Plečnik's attention was paid to the first floor entrance leading to the grand council chamber. The first floor also boasts a lush and interesting cassette ceiling. Next to the walls, Plečnik placed a number of floor lamps with brass bases, which create interesting lighting effects on dark stone slab-covered walls. The major features of the second floor are a row of dark columns and a wooden snake-like pillar.