Glass doors are commonly found in which type of buildings?

Glass doors are frequently used in mercantile buildings due to their aesthetic appeal and functionality. Mercantile buildings include retail stores, shopping centers, and other commercial spaces where visibility and accessibility are important. Glass doors enhance the customer experience by allowing potential customers to see into the store, showcasing products and creating an inviting atmosphere. The use of glass also allows for natural light to enter, making the space more pleasant for both workers and patrons.

In contrast, while glass doors may be found in residential, industrial, and municipal buildings, they are not as characteristic of those types. Residential buildings more commonly utilize traditional doors for privacy and security, industrial spaces often prioritize durability over aesthetics, and municipal buildings may focus more on functionality and safety. Thus, the distinctive presence of glass doors in mercantile buildings makes them the correct answer.