In October, Frank Gehry unveiled these overwhelming-looking plans for an enormous entertainment district in Toronto, with three 80-plus-story residential towers and a 60,000-square-foot art gallery. No specifics on start or completion dates, though.
After more than three years of arrested development, construction resumed for Herzog & de Mueron's tower at Manhattan's 56 Leonard in October. The building is slated to be finished in spring 2016.
In the spring, Thom Mayne's firm Morphosis unveiled designs for France's tallest building, the Phare Tower for Paris' La Défense business district, to be finished in 2017.
Renzo Piano's Shard building, which for now holds the title of Europe's tallest tower, officially opened in London on July 5. Many were not fans.
At 650,000 square feet, Bjarke Ingels' 8 House -- a bow-tie-shaped complex designed so residents can travel from the ground floor to the 10th via bike -- would be the largest private development ever built in Denmark. He disclosed the designs way back in January.
Another Koolhaas rendering, released this summer, for the Saxony Hotel in Miami Beach.
Here's another tabled project that has seen action in 2012: construction for Christian de Portzamparc's "Fortress of Glassitude" at 400 Park Ave. South in NYC resumed this spring.
In October, Chad Oppenheim announced he teamed up with -- of course! -- rapper Pharrell Williams to churn out these staggering renderings for Ice Cream City, for which there are few, if any, concrete plans.
Santiago Calatrava's rather lovely Margaret Hunt Hill Bridge, which stretches across Dallas, Texas, was completed early this year.
In October, Thom Mayne unveiled these plans for Cornell Tech NYC's Roosevelt Island campus, which is said to be complete by 2017.
Another wacky rendering by Bjarke Ingels: two luxury condo towers in Miami twist toward the sky in a way that looks like they're dancing with each other. The plans were revealed this summer.
Norman Foster's winning proposal for the redesign of 425 Park Ave. in NYC, to be finished by 2017.
The write-up for Zaha Hadid's (losing) competition proposal for 425 Park Ave. touts the plan as "a structure of timeless elegance, yet with a strong identity that reflects the complex and sophisticated age in which it was created."