Bulgaria's Aktiv Properties REIT [BUL:5AX] said on Wednesday that it has acquired 21 rooms in a residential building in the city of Pleven from local company HEM for a total of 100,000 euro ($113,120).By buying the flats Aktiv Properties REIT became the sole owner of the building, as it acquired all other parts back in 2008, the real estate investment trust said in a bourse filing.The acquisition allows the company to start the implementation of its investment plans for the reconstruction and modernisation of the building, the REIT said.Aktiv Properties REIT will pay 80% of the sum in deferred payments.($ = 0.8840 euro)