(as well as the Victorian city centre districts immediately surrounding them) are almost exclusively tenements. The Tenement House historic house museum in the Garnethill area of Glasgow preserves the interior, fittings and equipment of a well-kept, upper middle-class tenement from the late 19th century. Many tenements in Glasgow were demolished in the 1960s and 1970s because of slum conditions, overcrowding and poor maintenance of the buildings. Perhaps the most striking case of this is seen in the Gorbals, where virtually all the tenements were demolished to make way for tower blocks, many of which have in turn have been demolished and replaced with newer structures. The Gorbals is an area of approximately 1 km2 and at one time had an estimated 90,000 people living in its tenements, leading to very poor living conditions. The population now is roughly 10,000. Tenement demolition was to a significantly lesser extent in Edinburgh, thus making its later World Heritage designations in 1985 possible. Largely, such clearances were limited to pre-Victorian buildings outwith the New Town area and were precipitated by the so-called "Penny Tenement" incident of 1959 in which a tenement collapsed. Apartments in tenement buildings in both cities are now often highly sought after, due to their locations, often large rooms, high ceilings, ornamentation and period features. Berlin In German, the term corresponding to tenement is Mietskaserne, "rental barracks", and the city especially known for them is Berlin. In 1930, Werner Hegemann's polemic Das steinerne Berlin (Stony Berlin) referred to the city in its subtitle as "the largest tenement city in the world." They were built during a period of great increases in population between 1860 and 1914, particularly after German unification in 1871, in a broad ring enclosing the old city center, sometimes called the Wilhelmian or Wilhelmine Ring. The buildings are almost always five stories high because of the mandated maximum height. The blocks are large because the streets were required to be able to handle heavy traffic, and the lots are therefore also large: required to have courtyards large enough for a fire truck to turn around, the buildings have front, rear, and cross buildings enclosing several courtyards. Buildings within the courtyards were the location of much of Berlin's industry until the 1920s, and noise and other nuisances affected the apartments, only the best of which had windows facing the street. One notorious Berlin Mietskaserne was in Gesundbrunnen, which at