The latest commercial stair trends are:

1. Glass railings: Glass railings provide a sleek, modern look and allow light to pass through.
2. Floating stairs: Floating stairs appear to be suspended in air, creating a visually striking design element.
3. Industrial design: Industrial design elements, such as metal and concrete, are becoming increasingly popular in commercial spaces.
4. Wood treads: Wood treads are a warm, natural material that can be incorporated into many different design styles.
5. Spiral staircases: Spiral staircases are space-saving and can add an eye-catching design element to a space.

These trends can vary based on regional and local design preferences. It’s important to consider factors such as durability, safety, and maintenance when choosing a stair design for a commercial space.