The St. John’s Partners project, planned for the current St. John’s Center site, across from Pier 40, would include nearly 500 units of affordable housing, more than 170 of those for seniors. In renderings of the project, from top to bottom, a family in an affordable unit in a planned mixed-income building enjoys a view of the Hudson River; A couple take a selfie as they stand in a new public park space that would be created using the High Line’s old rail bed, while seniors, at right, enjoy a community space in their own building; Seniors hang out on the terrace outside their community space, inside which a game of bingo is going on; The entrance, on Washington St. near Houston St., of the mixed-income building.