More details emerging (thanks to the Puget Sound Business Journal) on a proposed developed by the city of Seattle, King County and Forterra, a nonprofit formerly known as the Cascade Land Conservancy.
"A proposed program would …make developers buy development rights for farms and forests; in return, developers would be able to build bigger buildings. If they buy the rights, that protects the farms and forestlands from development.
The draft requirement would be in addition to current rules requiring developers to support affordable housing and child care in the area if they want more space."
see: www.facebook.com/thriveSeattle for a map of the proposed boundaries