This holiday season, Tom Dougherty will have a new way to entice his clientele.??In 2008, the retailer-manufacturer bought a building in ­Woodstock, Ill. His plan: Create a 6,000-square-foot showroom and 8,000-square-foot ­manufacturing facility for his jewelry company, Studio 2015, and rent the rest to an outside client.But the recession made the space “fairly difficult to grow,” says the ­jewelry veteran, and it remained unoccupied for years. Instead of accepting defeat (or jumping ship entirely), Dougherty doubled down by building out an additional 3,500 square feet.In September, he debuted the Design Center, a high-tech, multiuse space kitted out with upscale party props—from massive flat-screen TVs and oversized sofas to a wood-fired bread and pizza oven. The jewelry shop is adjacent to the space, which Dougherty rents to groups for special occasions. Weeks before opening,