The architect is studying the blueprints for the new building in his office.

blueprints 是 blueprint 的复数形式。blueprint 由 blue（蓝色）和 print（印刷品）组成，原指用蓝色背景和白线绘制的工程图纸，现泛指"详细的设计方案或计划"，在建筑领域特指"建筑图纸"或"设计蓝图"。