Until the late 1990s, Dar es Salaam was not regarded in the same echelon as Africa's leading cities like Cairo, Alexandria, Giza, Nairobi, Johannesburg, Lagos, or Addis Ababa. During the 2000s, businesses opened and prospered; growth expanded in the construction sector, with new multi-storey buildings, bridges and roads; Tanzanian banks headquartered in the city became better regulated; and the Dar es Salaam Stock Exchange expanded. The port is prominent for entrepot trade with landlocked countries like Rwanda, Burundi, Zambia, and the eastern portion of the Democratic Republic of the Congo. The city's skyline features tall buildings, among them the 35-storey PSPF Tower (finished in 2015) and the Tanzania Ports Authority (TPA) Tower, the tallest in the country (completed in 2016).