KIAMESHA LAKE, N.Y. — There was a time when comedians would flock to the Concord Hotel, bringing the house down every weekend with ethnic humor, one-liners and a smattering of risqué jokes. Now, firefighters come to this shuttered monstrosity once a year to burn the house down, section by section. From around the state, firefighters arrive at the Concord not for matzo ball soup, but to tramp through its corridors — setting fires and then putting them out — during a training weekend arranged by the New York State Association of Fire Chiefs. Arthur Winarick, a Russian immigrant who acquired...