Plans - Stair Core Drawings Herzog & de Meuron plans: Stair Core 1 (B126-96-09-120-C1), Stair Core 2 (B126-96-09-120-C2), Stair Core 3 (B126-96-09-120-C3), Stair Core 4 (B126-96-09-120-C4), Stair Core 5 (B126-96-09-120-C5). 05 Sep 1996