Growing: Apartments.com, owned by D.C.-based CoStar Group, has acquired Westside Rentals, a Santa Monica, Calif., company that runs a website specializing in Southern California real estate rentals. Terms were not disclosed. Back for more: Iridium has signed an agreement to launch more satellites on SpaceX’s Falcon 9 rocket. The company previously had plans to deploy a constellation of 70 communications satellites with SpaceX. The latest deal for an eighth launch brings that total to 75 and includes two additional NASA satellites along for the ride. Done deal: Verizon Communications completed its $1.8 billion purchase of Herndonbased XO Communications’ fiberoptic business, which will allow the telecom giant to expand service to business and wholesale customers.