Real estate firms saw business activity increase over the past year as the housing market surged across the country. In 2020, single-office firms had a median brokerage sales volume of $4.5 million and 19 real estate transaction sides, up from $4.2 million and 18 in 2018, according to the National Association of REALTORS®’ newly released 2021 Profile of Real Estate Firms. The biennial survey reflects...