In the law firmsMahoney, Silverman & Cross LLC in Joliet added Marron A. Mahoney as an associate. She practices in the areas of corporate law, civil litigation, government law and appellate practice.• Starwood Property Trust announced that it will acquire a GE Capital energy finance unit for $2.56 billion.The acquisition is expected to close in the third quarter of 2018.Sidley Austin LLP served as legal counsel to Starwood.The lead Sidley partners on the deal were Richard W. Astle as well as Michael A. Gordon …