The nearly 109-year-old Willner Chemists — which specializes in vitamins and nutritional supplements — will stay put at 100 Park Avenue, Commercial Observer has learned. Willner Chemists signed a five-year renewal for its 11,386-square-foot space at SL Green Realty Corp.’s 36-story building between East 40th and East 41st streets, according to tenant brokers Lee & … Continue reading Willner Chemists Staying Put at 100 Park Avenue