While the broad cost implications of this credit are project-specific, it encourages code- minimum-or-less parking capacity, and reduced parking capacity will reduce construction costs as well as future maintenance costs.
While preferred parking is mostly covered by LEED v4 in LTc8: Green Vehicles, this credit includes a requirement for 5% preferred parking for carpools. Minor costs associated with preferred parking include advertisement of the spaces to potential users, unique parking decals/policies for compliant parties, and associated signage. 
Cost Synergies
All LT credits
SSc1: Site Assessment
SSc2: Site Development—Protect or Restore Habitat SSc3: Open Space
SSc4: Rainwater Management
Image (landscape):
