Richards Barry Joyce & Partners LLC has represented BG Medicine Inc. in a 21,550-square-foot lease renewal at 610 Lincoln St. North in Waltham. BG Medicine, a life sciences company focused on novel molecular diagnostics based on biomarkers, occupies space on two floors of the three-story building that is located in the Hobbs Brook Park. Jonathan Varholak, Ron Friedman and Jay Nugent represented BG Medicine in the lease. The building’s landlord, Hobbs Brook Management, was represented by Chip Batchelder of Wyman Street Advisors. MHT