A report by QSA has confirmed that the technical and engineering design of the modern architectural style (villas and residential apartments) has witnessed large expansion in the State of Qatar. The report points out that a rapid constructional development has taken place in terms of building, civil planning and designs of residential units from the perspective defining the constructional quality of the residential unit during the period between the two censuses conducted in 2004 and 2010.
  
   
 The report entitled "Development of Residential Units in the State of Qatar" added that the number of families residing in villas reached 49,402 in the 2010 Census compared with 24,982 in the 2004 Census, an increase of 24,420 families or 97,75%. The number of families living in hotel apartments was 53,807 in the 2010 Census compared with 29,833 in the 2004 Census, i.e. an increase of 23,974 or 80,36%.Retreat of the Old Architectural Style The old architectural style (Arabian houses, houses for low-income people, houses for the disabled, independent rooms and single rooms within a unit) are also in noticeable shortage in the quantitative perspective, which is in converse proportion with the qualitative perspective. Consequently, the number of families living in residential units of this style. The study points out that the number of families living in Arabian houses, houses for low-income people and houses for the elderly rose to 22,645 in the 2010 Census compared with 10,963 in the 2004 Census, i.e. a decrease of 5,419 families in the 2004 Census or 49.43%. The above figures show that considerable change has taken place in the familiar composition and a huge improvement has occurred in families' living styles in addition to change in families' financial resources, enabling families to spend money on building houses or search for suitable housing because of the family's good financial status, which has led to the rise or decrease of residential units in terms of the engineering development and technical design of the modern architectural style. The percentage of the increase of villas was the highest (97.75%) followed by residential apartments by 80.36%. The old architectural style witnessed a 15,72% decrease in the number of residential units, houses for low-income people and houses for the disabled, while residential units such as independent rooms and single rooms in a unit witnessed a decrease of 49,43%.
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