WASHINGTON — Silver Spring, Maryland-based Discovery Communications has settled on 230 Park Ave. South for its new Manhattan headquarters, and will begin making the move late next year. Discovery announced in January it would leave its longtime Silver Spring headquarters for New York, following its $12 billion acquisition of Knoxville, Tennessee-based Food Network and HGTV owner Scripps Networks Interactive. Discovery employs about 1,300 people in Maryland. Discovery has signed a long-term lease for 360,000 square feet, the majority of the building, and will house at least 1,000 employees at the new location. In addition to relocating its Silver Spring headquarters, Discovery will consolidate several of its existing New York office locations to the new space. Moving begins in fall 2019 and will continue through mid-2020, following a renovation of the new facility, Discovery said.