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NEW YORK CITY — Horizon Kinetics Asset Management has signed an 18,713-square-foot office lease at Rockefeller Center in Midtown Manhattan. The firm is relocating from 470 Park Avenue South to the 27th floor of the 31-story building at 1270 Avenue of the Americas. Independent broker Marc Miller represented the tenant in the lease negotiations. Blythe Kinsler and Kate Walker internally represented the landlord, Tishman Speyer.