Anis Rahmani is the latest figure close to the clan of former President Abdelaziz Bouteflika to be handed a heavy penal sentence.
As Somalia descended into civil war in early 1990s, the premises were supposedly put on sale by the then ambassador in 1994.
About 20,000 Ethiopians have fled into neighbouring Sudan following the outbreak of fighting.
He vowed to ensure integrity of government.
It is estimated that the government loses 30 percent of its annual budget to corruption, leading to persistent budget deficits.