Maxim Integrated Products Inc. sold the property at 6431 Longhorn Drive in Irving, TX, to Quality Technology Services. The price was not disclosed. Built in 1997, the three-story, Class B industrial building is in the Las Colinas Business Park. The high vacancy structure is 624,473 square feet on 39.03 acres. The property also has its own substation that can handle 70 megawatts. Scott Jessen, principal, and Scott Morse, managing director, with Citadel Partners represented the seller. Bo Bond, managing director, with Jones Lang LaSalle represented the buyer.