They had a smaller building first: youtu.be/BPq_ZyOvbsg?t=51 and in 1962 opened the large new building.
Video 1. Holmdel 20th Anniversary by AT&T Tech Channel (1982) Source. Video 2. N.J.’s historic Bell Labs complex brought back to life as Bell Works by nj.com (2022) Source. Shows the renewed building after the Bell Labs Holmdel Complex closure.
Ciro Santilli