The building is the Albergo Bianco, here in Garbatella, a suburb of Rome. Under the auspices of the Istituto per le Case Popolari (ICP), a national building society dedicated to public low-cost housing, Innocenzo Sabbatini had a series of four “suburban hotels”–Lots 41, 42, 43, and 44 constructed. Initially designed as short-term accommodation for new arrivals waiting for more permanent lodgings, the albergi also included public services like day care, police offices, and health services. The buildings were converted to apartment blocks in the mid 1930s.
For an excellent introduction to Garbatella, with a recommended walking itinerary, I highly recommend Rome the Second Time: RST Top 40. #16: Garbatella