Security

The large panes of glass on the storefront façade often make potential residents wary, as they can be easily broken. An unfortunate response is to install bars over the windows, which destroys one of the best features of the space and creates a “jailed” environment. Security options that minimize intrusions on the space's character and features include:

• Gates, Doors and Grills: Wrought iron gates or doors can be compatible with the space when used with the building's architecture in mind. Recessed doorways and the two- or three-foot gaps that may appear between buildings are great locations for gates. Another option is to install a retractable security grill (either in front or behind the glass), which can be put in place at night.

• Safety Glass: Appropriate in high-crime areas. The most common types are laminated, tempered and polycarbonate (plastic) sheets.
  

Laminated glass consists of two pieces of glass affixed to a film of clear plastic that lies in the middle. This tough, invisible, elastic film will hold a broken sheet of glass together, even when it is shattered into many pieces. For noise reduction, laminated glass can also be used in a double layer set-up, with airspace between the two sheets.

Tempered glass has been specially treated with heat to increase its strength. When broken, it shatters into little shards that are relatively safe to handle.

Polycarbonate, a strong plastic substitute for glass, is highly resistant to damage, but can be easily scratched and cut. Slightly less clear than glass, it is also more expensive, and will discolor over time due to solar degradation. It also has a high degree of thermal expansion, and might bow in Chicago and other places where outdoor temperatures vary greatly.


• Glass Block: Although typically translucent instead of transparent, glass block still delivers a large amount of light into the space and can be purchased in clear blocks as well. Its strength and sound-insulating properties make it an option in high-risk areas and on heavily traveled streets. On the downside, an entire wall of glass block will not meet building code requirements, and might destroy the openness associated with storefront spaces.