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NEW YORK CITY — HLTH, which organizes conferences and events for the healthcare industry, has signed a 19,000-square-foot office lease expansion and renewal at 10 Grand Central in Midtown Manhattan. The firm is growing its footprint from 7,000 to 19,000 square feet on the sixth and seventh floors. Marx Realty owns the 35-story building and completed a $48 million redesign and capital improvement program in 2019. JLL represented the landlord in the lease negotiations.