A building whith a primary purpose of providing storage space for automobiles. Its main benefit is providing many more spaces in the same amount of horizontal land area. A common occurrence in urban areas and malls.

My favorite deck belongs to my school. It has a simple layout that makes it impossible to get lost within in, and allows traffic to flow. There is never any opposing traffic since all lanes are one-way only. It also has nice architecture. Alternating open-air and closed walls breathe a surprising amount of life into the building.

There are too many badly designed decks for me to mention. The most glaring problem with these are two-way traffic lanes that back traffic up in all directions when cars are going in or out of a space. These annoy me to no end.