A three-storey building module, 30 by 30 metres, one of a set, originally made for creating a hospital but suitable for any large building such as a hotel or office block. The set includes modules 30 by 30, 30 by 60 and 30 by 90 metres, one, two, three, four and five storeys high which may be assembled in any configuration as needed by the user. Use my 'Building entrance 1' or 'Building entrance 3' to create a renameable entrance for any building module.