Vantage Builders completed major renovation and upgrade work at 300 Apollo Drive in Chelmsford, on behalf of Tritower Financial Group.  Projects in the 296,158 square foot, Class A office building include renovations to the lobby and common areas, a new game room, new 75-person conference room, new office for property management and upgrades to the cafeteria.  The improvements are intended to help Tritower Financial Group attract new tenants to the three-story building.