Habitat 67 comprises 354 identical, prefabricated concrete forms arranged in various combinations, reaching up to 12 storeys in height. Together these units create 146 residences of varying sizes and configurations, each formed from one to eight linked concrete units.[6] The complex originally contained 158 apartments,[7] but several apartments have since been joined to create larger units, reducing the total number. Each unit is connected to at least one private terrace, which can range from approximately 225 to 1,000 square feet (20 to 90 m2) in size.[6]
The development was designed to integrate the benefits of suburban homes, namely gardens, fresh air, privacy, and multilevelled environments, with the economics and density of a modern urban apartment building.[1] It was believed to illustrate the new lifestyle people would live in increasingly crowded cities around the world.[8] Safdie's goal for the project to be affordable housing largely failed: demand for the building's units has made them more expensive than originally envisioned.[1] In addition, the existing structure was originally meant to only be the first phase of a much larger complex, but the high per-unit cost of approximately C$140,000 prevented that possibility.[9][clarification needed]
The theme of Expo 67 was "Man and his World", taken from Antoine de Saint-Exupéry's memoir Terre des hommes (literally "land of men", though it was published under the title Wind, Sand and Stars). Housing was also one of the main themes of Expo 67. Habitat 67 then became a thematic pavilion visited by thousands of visitors who came from around the world, and during the expo also served as the temporary residence of the many dignitaries visiting Montreal.
In March 2012, Habitat 67 won an online Lego Architecture poll and is a candidate to be added to the list of famous buildings that inspire a special replica Lego set. Lego blocks were actually used in the initial planning for Habitat; according to Safdie's firm, "initial models of the project were built using legos and subsequent iterations were also built with legos”.[10]