A corner of Mentor with a long history of development proposals is targeted for a senior housing complex.Beachwood-based Omni Senior Living seeks to develop 5.65 acres southwest of Interstate 90 and Route 615 for a 146-unit project consisting of 88 independent living units within a three-story wing, 40 units in a two-story assisted living wing and 16 units within a single-story memory care wing.