Developers of the former Showcase Cinema property in East Hartford discussed their plans to build as many as 420 upscale apartments at the Silver Lane site during a recent special meeting of the Town Council, saying they also plan to seek a nearly three-decade tax abatement on the project. New Britain developer Jasko Development and Zelman Real Estate have proposed an “amenity rich” rental housing project of 360 or more market-rate apartments with a number of facilities for tenant use. Goman said the town has contributed $16.2 million to the project, with $3 million in borrowing from the town, and the rest from state grants. About $6 million has been spent on cleanup and acquisition of the site. The $10.2 million will be used “to help catalyze the project and help the developer make this project make sense,” Goman said, adding that developers would also infuse about $81 million in private funding into the project.