I get a lot of questions about the changing Seattle Waterfront (not the Big Wheel, the real estate!). Here's an informative article: http://www.djc.com/news/ae/12044999.html
"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."