Turkish firm to launch mega-housing project in Angola ANKARA-Anadolu Agency A Turkish construction firm will launch a mega-housing project in Angola, marking the largest social housing project in the southwestern African nation. A total of 10,000 all-inclusive residences for Angolan teachers are set to be built by Onsan Group, a Turkish construction firm which has been operating more than 40 years. "We signed a protocol with the Angolan government to build these residences," company chief Fikri Coşkun