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NEW YORK CITY — Sigma Computing Inc. has signed an 11-year, 28,286-square-foot office lease expansion in Midtown Manhattan. The AI-driven software company now occupies 92,363 square feet, including the entire third floor, at One Madison Avenue. Brent Ozarowski, Jeffrey Rodgers and Stephen Cisarik of Newmark represented the tenant in the lease negotiations. Paul Glickman, Alexander Chudnoff, Ben Bass and Diana Biasotti of JLL represented the landlord, SL Green.