The Cambridge Fire Department responds to a chemical spill in 18-006 on Thursday evening. Building 18, the chemistry building, was designed by I.M. Pei and constructed in the 1960s. Greg Steinbrecher—The Tech May. 9, 2016 Facebook Twitter Reddit Print The Cambridge Fire Department responds to a chemical spill in 18-006 on Thursday evening. Building 18, the chemistry building, was designed by I.M. Pei and constructed in the 1960s. Greg Steinbrecher—The Tech