Demolition company Stamford Wrecking on Monday started knocking down one of at least three buildings that will be removed from the property in the coming months. A future redeveloper will decide whether a fourth building is taken down, said Tommy Hyde, interim director of Waterbury Development Corp. The site will retain the final building that the city spent $2.3 million on to repair its roof last year, he said. His Board of Directors in July approved a $2.5 million contract with Stamford Wrecking for the demolition. O’Leary said he believes the site, once fully remediated, offers the city and future tenant “a beautiful piece of property,” with it abutting the Naugatuck River. The city’s second phase of the Naugatuck River Greenway project will run through the site upon construction, a city document states.