For many decades, motorists and pedestrians alike have passed by a historic and mysterious stone structure in the Charlesgate area of Boston’s Back Bay. Hemmed in by Storrow Drive Eastbound and a Charlesgate offramp, the Fens Gatehouse (one of two) was originally designed by Shepley, Rutan and Coolidge and built in 1910 to house water flow control mechanisms for the Stony Brook into the Charles River. It was a key element of the Frederick Law Olmsted plan to reclaim the Back Bay Fens. When the original systems were relocated, the gatehouse was set to be repurposed for the DCR Flood Control Operations group. Finegold Alexander was hired for a feasibility study and then the meticulous restoration and renovation of the building to support the Flood Control Operation group with an open shop area, office space, a conference/lunchroom, restroom, shower and locker room. The site will also include staff parking spaces, generator trailer space, and the integration of a future bike path running through the site. The original Cape Ann and Quincy granite walls, copper trim, terra cotta roof tiles, and large, double-door opening were restored to maintain the early 20th-Century classical style.