I'm working on language for a new regulating plan and I've been asked to look for best practices/model language for open space standards. Specifically, we're looking for examples of design guidelines/standards for public and open space that would be used primarily by developers trying to comply with our parkland dedication ordinance (developments over a certain size/density provide a percentage in the form of private owned public space)

Anyone come across design guidelines or standards for public/open space that they thought worked particularly well in ensuring higher quality spaces?