Construction is expected to start later this year on a new luxury apartment complex near the planned SunRail station adjacent to Tupperware Brands Corp.’s headquarters. Jupiter-based Index Investment Group and Palm Beach Gardens-based Eastwind Development LLC are expected to choose a general contractor this spring for Monterey Point, a 150-unit, $19.8 million Class A multifamily development for active adults. The property offers luxury apartment living with features including four-story buildings…