The Blue Hill Observatory, pictured in March 2015. Planned renovations include a new concrete wall, weatherproofing, new ceilings, new windows and asbestos removal. (Simón Rios/WBUR) The Blue Hill Observatory located in a 113-year-old concrete tower in the Blue Hills Reservation is closed this summer for a $2 million renovation, its first major upgrade since 1999. The changes include a new concrete wall, weatherproofing, new ceilings, new windows and asbestos removal, officials said, all paid for through a state Department of Conservation and Recreation grant. One thing will not change, howe...