In this article about a section near Los Angeles, CA. there is the suggestion that their regional planners have authority to approve high density developments.
“The last remaining road blocks barring construction of more than 500 homes between Shadow Pines and Agua Dulce were removed Thursday by regional planners.
The Spring Canyon Project faces one final hurdle next month when it goes to the hearing officer of the Los Angeles County Department of Regional Planning, paving the way for construction to begin.”
In NH, Regional Planning Commissions have NO governing authority. This could change however. The problem with NH’s RPCs is that they continue to bring in other unaccountable and unelected private and non-governmental groups to inject their agendas in your town government.