A building exclusively for commercial activities. Historically, Macao was underdeveloped because of its slow economic development, and most businesses were opened at the bottom of old style residential buildings. At the end of 1960s, Macao's first dedicated office for business (Office) rental commercial building, Wing Hang Bank building completed. Subsequently, Nanguang building has also been completed by Nanguang company. In 70s, Dafeng bank building was completed in 1974. Later, it was built into Tak Kee commercial building. However, at this time, Macao rental office space is still less than 4000 square meters, commercial building construction is still very few.