KING COUNTY, Wash. — Residents of King County, Wash., will only be able to build on 10 percent of their land, according to a new law being considered by the county government, which, if enacted, will be the most restrictive land use law in the nation. Known as the 65-10 Rule (search), it calls for landowners to set aside 65 percent of their property and keep it in its natural, vegetative state. According to the rule, nothing can be built on this land, and if a tree is cut down, for example, it must be replanted. Building anything is out...