Have you seen a 45-ton, 75-foot spruce tree you want to wrap up and bring home? Or maybe you've spotted a cute little stand of Japanese maples—30 tonners—that would look great sprouting blossoms in your backyard. We know just the guy to call. But hold up, because moving monster trees is not something you dream up over beer and ribs at Saturday's barbecue to do for kicks Sunday morning. For 17 years, urban-foresters Steve Clark and Associates, of Brentwood, Tenn., have been advising developers on how to transplant trees or preserve them on site. In many cases, Clark and his company consult during the planning stages of a project, and architects will actually change a building's design to feature trees