The superheated housing market isn't a bonanza for everyone: Residents of at least four Portland area manufactured-housing parks have been forced to move in the past few months as park owners, seduced by skyrocketing land prices, sell to developers. Manufactured home parks in Beaverton, Tualatin, Wilsonville and West Linn serving primarily low-income older residents have shut down within the past six months or are in the process of closing. They're being redeveloped for retail use or housing, with rents expected to far exceed what is collected from park residents. "Everybody's upset," said Vera Loar, 90, a 20-year resident of a...