may modify or eliminate the municipality's dimensional standards
in order to support desired densities, mix of uses and physical
character. The standards that are subject to modification or
waiver may include height, setbacks, lot coverage, parking
ratios and locations and roadway design standards. Modified
requirements may be applied as of right throughout all or a
portion of the smart growth zoning district, or on a project-
specific basis through the smart growth zoning district plan
review process as provided in the ordinance. A municipality may
designate certain areas within a smart growth zoning district as
dedicated perpetual open space as defined in section 2(4) of the
act of January 19, 1968 (1967 P.L.992, No.442), entitled "An act
authorizing the Commonwealth of Pennsylvania and the local
government units thereof to preserve, acquire or hold land for
open space uses." The amount of open space shall not be included
as a developable land area within the smart growth zoning
district. Open space may include an amount of land equal to up
to 10% of what would otherwise be the developable land area if
the developable land area would be less than 50 acres and 20% of
what would otherwise be the developable land area if the
developable land area would be 50 acres or more.
(c) Mixed use.--The smart growth zoning district ordinance
may provide for mixed-use development subject to any limitations
that may be imposed by guidelines of the department.
(d) Historic district.--A smart growth zoning district may
encompass an existing historic district. A municipality, with
the approval of the department, may establish a historic
district in an approved smart growth zoning district in
accordance with the act of June 13, 1961 (P.L.282, No 167),
entitled "An act authorizing counties, cities, boroughs,
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