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To encourage higher densities on downtown residential streets , the city has okayed the subdivision of single-family lots , allowing a second unit to be built at the back of the lot . Like other public goods , from clean air to safe streets , social capital tends to be underprovided by private agents . Pima Association of Governments Regional Data Center - - provides access to spatial data of Pima County for census tracts , census blocks , census designated places , jurisdiction boundaries , major streets , and transportation analysis zones . He rushed on with unwearied steps , threading different streets , his companion striving to lead him homewards , but still in vain . Development policies are included which " Redefine Main Street " to establish it as a focal point , " Extending the Palisades Landscape , " bringing the characteristic landscape of the area into the Civic Center , and " Meeting the City Grid , " making the area accessible and friendly by incorporating visual corridors , mixed-use streets , and pedestrian and bicycle ways into the area .