Here's why:
* Classic Design: The show focuses on realistic portrayals of legal settings. A simple, straight staircase is typical in older buildings, like the one the show is set in.
* Visibility: The staircase is often shown in scenes, typically as Michael walks up or down. Its design is never a focal point, indicating it's a functional element meant to be unobtrusive.
* No Specific Details: There's no mention of a unique design, intricate features, or any specific material used.
Therefore, it's safe to assume the staircase is a standard, functional one, reflecting the show's emphasis on practicality and realism.