Coles Tower is getting a long overdue makeover. This summer, the College will spend $2.8 million to renovate the building, which turns 50 this year. Four floors will be renovated each year for the next four years. The completed project will cost approximately $5 million, according to Katy Longley, the senior vice president for finance and administration and the college treasurer. The College will partner with Harriman, an engineering firm in Auburn and Massachusetts-based Consigli Construction Company, which has an office in Portland. Consigli worked with the College in 2007on the Art Museum and in 2004 on the Chapel.