NASTY’S NEW HOME: Nasty Gal is growing up and out. The hot e-tailer will be moving into 50,000 square feet of office space — five times the size of its current offices — in downtown Los Angeles’ Pac Mutual Building the middle of next year. Nasty Gal has been on a tear of late, increasing sales from $6.5 million in 2010 to $28 million last year, and as much as $115 million by the end of this year. The company also unveiled a Web site redesign and an in-house label this year. Nasty Gal currently employs 150 people.