Japanese drug-maker Astellas Pharma opened its new $150 million headquarters for the Americas in a Chicago suburb Monday. The facility includes two seven-story glass-covered buildings totaling more than 400,000 square feet, six video conference rooms and green features, like landscape irrigation from retained storm water, company officials said. Astellas Pharma US Inc.'s headquarters were in suburban Deerfield but relocated nearby to Glenview with the help of about $4 million in incentives from the state of Illinois, mainly corporate tax credits.