By mid-2018, Chicago cybersecurity company Trustwave will occupy more than 100,000 square feet at 70 W. Madison St., its home since 2007. That's a 65 percent increase of its recent Chicago real estate footprint, and it comes hand in hand with some major hiring. Trustwave has hired over 160 new employees since 2016 (bringing their total headcount to 1,650 worldwide), and it continues to grow: The company has 50 current job openings and a second phase of construction will allow its workforce to grow…