DOWNERS GROVE, ILL. — Crown Castle has leased 48,000 square feet of office space at Highland Landmark II in Downers Grove. The provider of communications infrastructure is consolidating all five of its Chicago-area locations into the new space. Highland Landmark II, located at 3025 Highland Parkway, is a 284,000-square-foot building within a 42-acre office park. Amenities include a deli, conference center and fitness center. David Burden, Tom Berarducci and Jay Kyle of Colliers International represented Crown Castle in the lease transaction. Jeff Shay and Karla Harmon of JLL represented the building owner, James Campbell Co.