Irreplaceable • Esley Hamilton, St. Louis County’s preservation historian, faces a forced retirement because of cuts to the county’s parks department. Hamilton, 66, has been trying to retire for the past year, but his work wouldn’t let go of him. In recent months, he had led efforts to save a historic blacksmith shop in Spanish Lake, a Presbyterian church in Rock Hill dating back to 1839, and, unsuccessfully, the Brownhurst Mansion in Kirkwood, built in 1892. He has yet to step down mostly for a lack of a successor. He said he asked his bosses last year who might replace him. Their answer: No one.