What are today's office tenants looking for in a downtown high-rise? While an office tower's age, location and amenities continue to be key selling points, a growing number of companies are paying closer attention to sustainability and what impact the built environment might have on employee health and productivity. Taylor Johnson client Transwestern recently discussed the trend with REJournals.com, explaining how ongoing renovations at 200 West Madison and the tower's recent LEED recertification from Silver to Gold have boosted occupancy to 92.5 percent.