Conversation so far:
When did the renovations of Merchandise Mart take place
The Merchandise Mart was modernized in the late 1950s and 1960s.
What did the renovations of Merchandise Mart entail?
In 1962, a Merchandise Mart entrance canopy was constructed over the south for vehicle use.

Question: How much did it cost?
Self-contained rewrite: How much did the renovations of Merchandise Mart cost?