CoStar proposes to rehabilitate District's historic Franklin School

The fast-growing CoStar Group has a chic downtown corporate headquarters and is now aiming to expand into one of the city's most historic buildings, the Franklin School. Andrew Florance, chief executive of the commercial real estate data firm, said his company has nearly outgrown its 168,000-square-foot L Street headquarters. He is targeting the red brick former school building overlooking Franklin Square for more space.