PRINCE GEORGE'S COUNTY. 3985

of such zones regulations may be imposed designating the kinds of classes
of trades, industries, residences or other purposes for which buildings
or other structures or premises may be permitted to be erected, altered
or used or subject to special regulations. For the purposes of the powers
granted in this and the three subsequent sections of this Act, not less than
three members of either District Council shall constitute a quorum.

1927, ch. 448, sec. 21.

740. Whenever the Commission certifies to either District Council any
such plan for the districting or zoning of the portion of the District within
either County according to the height of buildings and other structures,
then such District Council, in the interest of the health, morals, safety
or welfare of that portion of the District, may regulate and limit the height
of buildings and other structures thereafter erected or altered and for said
purpose divide the said portion of the District into zones of such number,
shape and area as may be deemed best suited to carry out the purpose
of this section. Any such regulation imposing a lower height limitation
than may be provided by state statute or local regulation shall, within the

zone for which it is imposed, prevail over the said limitation provided by
state statute or local regulation.

1927, ch. 448, sec. 22.

741. Whenever the Commission certifies to either District Council any
such plan for the zoning of its portion of the said District according to
the bulk and location of buildings and other structures (including per-
centage of lot occupancy, set-back building lines, and area of yards, courts
and other open spaces), then such District Council may, in the interest of
the promotion of the health, morals, safety or welfare of that portion of
the District, regulate the bulk and location of buildings and other struc-
tures thereafter erected or altered, the percentage of lot occupancy, set-
back building lines and the area of yards, courts and other open spaces
and for said purposes may divide the said portion of the District into
districts of such number, shape and area as may be deemed best suited
to carry out the purposes of this section. Any such regulation imposing
a less percentage of lot occupancy, wider or larger courts, deeper yards or
other more strict limitations than those provided by state, county, munici-
pal or other local regulation shall within the area for which it is imposed,
prevail over the said limitations provided by such state, county, municipal
or other local regulation.

1927, ch. 448, sec. 23. 1929, ch. 286, sec. 23.

742. The zoning of the district may be based upon any combination
of two or more of the purposes described in Sections 739, 740 and 741 of
this subtitle. The respective District Councils may, from time to time,
amend or change the number, shape, area or regulation of or within any

district or districts; but no such amendment or change shall become effec-
tive unless the regulation proposing such amendment or change shall be