Section 25-110. City planning commission to regulate the height and bulk of buildings, areas of yards, courts and open spaces and density of population

a.  The city planning commission, subject to the provisions  of sections one hundred ninety-seven-c, two hundred and two hundred  one
  of the charter, where applicable, shall have power to regulate and limit
  the  height and bulk of buildings, to regulate and determine the area of
  yards,  courts  and  other  open  spaces  and  to  regulate  density  of
  population.  The commission, subject to the same limitations, may divide
  the city into districts of such number, shape and area as  it  may  deem
  best suited to carry out such purposes.
    b.  The  regulations  as  to height and bulk of buildings, the area of
  yards, courts and other open spaces and density of population  shall  be
  uniform  for  each  class  of  buildings  throughout  each district. The
  regulation in one or more districts  may  differ  from  those  in  other
  districts. Such regulations shall be designed to secure safety from fire
  and  other  dangers  and  to  promote  the  public  health  and welfare,
  including, so far as conditions  may  permit,  provisions  for  adequate
  light, air and convenience of access.
    c.  The  commission  shall  pay  reasonable regard to the character of
  buildings erected in each district, the value of the land and the use to
  which it may be put, to the end that such regulations may promote public
  health, safety and welfare and the most desirable use for which the land
  of each district may be adapted and may tend to conserve  the  value  of
  the buildings and may enhance the value of land throughout the city.