A partnership led by BlackRock is gauging buyer interest in its office building at 600 Third Avenue. BlackRock has a 95 percent stake in the building, and L&L Holding Company owns the remainder. BlackRock is now approaching possible buyers, Real Estate Alert reported. However, it’s not known how much of its stake the firm wants to sell. Last year, BlackRock and L&L hired Eastdil Secured to begin shopping a 49 percent interest in the building, […]