Chicago-based residential brokerage @properties has picked up a top agent in the North Shore who’s also a co-founder of Northfield-based homebuilder Heritage Luxury Builders. Milena Birov has left Koenig & Strey GMAC Real Estate to join @properties, along with her husband and Heritage co-founder, Leo Birov. The couple, which immigrated from the former Soviet Union, started Heritage Luxury in 1990. The firm now has 14 projects under way, including custom and spec homes, in the northern suburbs, Lincoln Park and suburban Milwaukee. Ms. Birov, 60, has averaged almost $30 million in home sales over the past four years. She was the North Shore’s second-highest producing agent in 2009, with volume of $24.2 million, according to a statement from @properties citing BrokerMetrics LLC data. The Birovs’ daughter, Victoria, and son-in-law, Steven Aisen, are also Heritage executives and have become @properties agents.