Known to architects for the dozens of design showrooms it houses and the annual NeoCon tradeshow it hosts, Chicago’s Merchandise Mart may also become a major center for the city’s tech industry. Crain’s is reporting that Google is planning to lease half a million square feet in the mammoth building, and will add a large roof deck offering city, river, and lake views. The deck will, no doubt, help compensate for the massive floorplates that will leave most employees far from natural light. Google will also bring 3000 jobs–from a Motorola division they acquired–from the suburbs to downtown.