Screening Out the Neighbor's House

"My next door neighbor is building a two story house which will be right over our patio, and from our bedroom upstairs we will look right into their house. Are there any plants or trees we could plant that will grow about 30 feet high to block the view?" begins this thread on the Landscaping Message Board. Will our experts suggest trees to solve the problem, or other screening options instead? Tune in to find out.