 Complete the following phrase:  The earliest housing scheme comprises small, semi-detached houses, which have been built in the 1950s by Communist party workers, with the first tower blocks being built in 19661967. Later, in the 1970s and 1980s, most of the present-day blocks of flats with 8 and 10 floors were built. Amongst the well-known apartment buildings are the B22 Block, built from 1977 to 1979 by Yugoslav architects, the 15-storey tower blocks at Lujerului right next to the so-called Serbian block, also designed by Yugoslav architects, completed in 1974, and the OD16 block, initially built sometime between 1972 and 1975, but fully collapsed during the 