In order to qualify for the floating zone, developments of 2 units or more must be 50% affordable units. For rental units, households must make under 60% of AMI. For-purchase units, households must make under 80% of Westchester County AMI. The units must remain affordable for 50 years. The Board of Trustees can permit modification or waiver of the applicable dimensional and bulk requirements. To the extent practicable, the Board of Trustees and Planning Board shall prioritize affordable housing floating zone applications.