Plans to tear down a historic Northampton home are on hold for a year. The Historical Commission has delayed demolition of the 175-year-old Louise Finn house at One Denniston Place. Cooley Dickinson says bringing the building up to current medical standards would cost about a million dollars, but the commission says the house is structurally sound and has important ties to Northampton history, including the anti-slavery movement. The hospital can revisit demolition once the delay expires.