Location. Sidewalks shall be constructed on both sides of all public and private streets, except where the city determines that due to topography or other physical or environmental constraints, such construction would be infeasible or contrary to the public interest. The city may also waive the sidewalk requirement on one side of a public or private local street or access lane within a planned development, small lot development, or other residential development subject to site plan approval, when no dwelling units will be constructed on that side of the street and the city has determined that a sidewalk is not required on this street segment to provide access to adjoining open space, recreational facilities or other properties. The city may also waive the sidewalk requirement on one side of an access lane when such street provides access to not more than six dwelling units, provided the city makes a determination that such design will allow for the provision of safe and functional pedestrian circulation within the development. The city may require a walkway, path or other pedestrian facilities to be constructed at an alternative location in lieu of a sidewalk constructed parallel to the street in order to ensure continuous pedestrian connections throughout a planned development, small lot development, or other residential development subject to site plan approval.