Greystar plans to develop a 300-unit apartment community and a 160-unit seniors housing property within Halcyon, a $370 million mixed-use development located off exit 12 on Ga. 400 in Forsyth County. The multifamily community, known as Elan Halcyon, will feature top-of-market amenities and 11,000 square feet of ground-floor retail space. The seniors housing property will feature 12,000 square feet of resort-style amenities, including a resident clubhouse, pool and spa, demonstration kitchen, game room, theater room, fitness center and a golf simulator. RocaPoint Partners, an Atlanta-based affiliate of The Georgetown Co., is the master developer of Halcyon. Set to open in 2018, the development will include more than 500,000 square feet of office and retail space, a high-end CMX movie theater, two hotels and 690 residential units, including Greystar’s two projects.