LOS ANGELES — BH Properties has begun an investment initiation into affordable housing with the goal of building a $1 billion portfolio of assets. The new platform will focus on low-income housing tax credit, Section 8 and age-restricted housing throughout the United States. The initiative will be led by William Stoll, who BH Properties hired as a managing director. Prior to joining BH Properties, Stoll worked at Steadfast Companies for 14 years. He joined the firm in 2009 as the manager of a Southern California portfolio of 10 LIHTC properties and eventually rose to the role of executive vice president of acquisitions. Stoll graduated from San Diego State University.