TWO more glass skyscrapers are being added to the growing collection of towers on the waterfront in Long Island City in Queens.

The rental towers are part of East Coast, a project being developed by one of the city’s most prolific builders, TF Cornerstone. When completed in early 2014, East Coast will consist of six skyscrapers clustered around the giant Pepsi sign on the East River waterfront, with almost 2,800 units.

The East Coast collection already includes 47-20 Center, a tower with 498 rentals built in 2006, and the View, a condominium building with 185 units at 46-30 Center, finished in early 2010. One of the new buildings, a 42-story tower at 46-15 Center Boulevard, will open next month. The building is angled so that every one of the 367 apartments has at least a small view of Manhattan, and most have sweeping vistas of the city skyline. A second tower, at 45-40 Center, with 32 stories, has 345 apartments and should be renting by June.

A third tower, with 820 rental apartments, at 45-45 Center, is already under construction, along with a 1,000-car parking garage and a fitness and recreation center with 50,000 square feet of outdoor space. The recreation center will have a great lawn, two tennis courts, a beach volleyball court and a children’s playroom, among other amenities. It will be open to all residents of East Coast buildings, though each building also has its own small fitness center.