 Typical apartments of the K-7 series have a total area of 30 m2 (323 sq ft) (one-room), 44 m2 (474 sq ft) (two-room) and 60 m2 (646 sq ft) (three-room).Later designs further reduced these meager areas.Rooms of K-7 are "isolated", in the sense that they all connect to a small entrance hall, not to each other.