Boston Properties plans to spend $4 million to $5 million to give Reston Town Center’s public plaza a makeover. The 30-year-old Reston Town Center, which was a vanguard of the now ubiquitous town center concept, will undergo a multimillion dollar renovation of its common areas with an eye toward updating the 3.6 million-square-foot mixed-use center. The revamp, driven by owner Boston Properties (NYSE: BXP), will mainly focus on the central gathering areas in the site. There’s the possibility for some kind of outdoor beer or wine garden setup there, said Lisa Stoddard of CBRE, who represents the property in lease deals. The project will aim to soften existing public spaces, and make them more modern and contemporary, so that people are more inclined to hang out. The plan includes creating more programs and events to engage people, so that there is always “interactive things going on on the green,” Stoddard added.