Conversation so far:
What occured on Lake Shore Drive with Ludwig Mies van der Rohe?
Ludwig Mies van der Rohe designed a series of four apartment buildings for developer Herbert Greenwald: the 860–880 and 900–910 Lake Shore Drive towers on Chicago's Lakefront.
Did Ludwig Mies van der Rohe play a part in the building of these apartments on Lake Shore Drive?
The 26-floor, 254-ft tall towers were designed by the architect Ludwig Mies van der Rohe, and dubbed the Glass House apartments.

Question: What material were they built from?
Self-contained rewrite: What material were the Lake Shore Drive apartment buildings built from?