The two Royal Bank Plaza towers are connected by a 39-meter (130 foot) tall glass Banking Hall.
All 14,000 windows of the towers are coated with a layer of 24-karat gold (2,500 ounces or 70,875 grams), worth about $70 per window. The total amount of gold used in the windows is just over $1,000,000.
Not only does this gold give the buildings a particular look (especially in sunlight), it also reduces heating bills, as gold is an excellent insulator. The manufacturing process for the glass has made the gold non-recoverable.