Starting Wednesday, New Yorkers earning between 50 and 60 percent of the area media income can apply for eight units in the heart of East Williamsburg. The apartments — six one-bedrooms for $1,020/month and two two-bedrooms for $1,224/month — are located at 845 Grand Street, a new contemporary rental building with high-end interiors and a bevy of trendy amenities, including a 4,000-square-foot roof deck with hammocks and a turf lawn, communal backyard, gym with yoga room, bike room, laundry room, and indoor lounge with pool tables.