Richard Meier and Partners just unveiled plans for a 40-story mixed-use tower that will become one of Mexico City's tallest buildings. The luxury development will be a rare tower project for the architect—now 80—whom The New York Times reported was turning his focus back home, to New Jersey, just last week. [Archinect]

At first glance, this winning design for a mixed-used complex in Zhejiang Province design by Liu Xisang seems like just another glassy tower project. But take a closer look at the facades, which are laced with a network of outdoor spaces spiraling upwards to connect the ground floor to the roof with…