Forever 21, which last year signed a lease for the enormous former Virgin Megastore space at Stockton and Market, is about to get its second Union Square-adjacent store. The chain's spinoff brand, XXI Forever, which targets a "slightly older demographic," is going into the 53,000-square-foot space just a block away from Forever 21's flagship at 1 Powell Street. (Signage just went up this morning.)

The growing XXI Forever brand of stores has been moving into malls around the country, and features special in-store boutiques or "rooms" such as the the "Silver Glitter Room," the "Bubble Room" and the "Love Room," where intimate apparel is sold.

It's actually not the only former Virgin location that Forever 21 has snagged — they did something similar in NYC with the former Times Square Virgin Megastore.

The opening of XXI Forever was originally slated for last summer, but was apparently delayed by the big mess of the Muni Central Subway line preliminary dig — construction crews had been using the Virgin store as a base of operations, complete with porta-potties and such.

Look for the opening early in 2012.