Once again, Watertown was a popular place for homebuyers in 2018, and four agents sold more than $10 million in properties during the calendar year. The top selling agent for 2018, according to sales reports on the Multiple Listing Service (MLS) was Ari Koufos of Realty Executives in Watertown. The Watertown resident took part in 26 sales, for a total of $21.91 million. The figure does not include residential rentals or commercial real estate transactions. Koufos noted that many of others who made the top 10 list also live in town.