San Francisco — In response to an increased demand for retail property management services, JLL has agreed to acquire Shelter Bay Retail Group, a retail property management firm based in Mill Valley, Calif. The addition of Shelter Bay’s 74 urban and suburban, open-air shopping centers is expected to increase JLL’s third-party retail property management portfolio in the United States by 6.5 million square feet to a total of 83.5 million square feet.