The real estate developer Gotham Organization plans to lease land owned by the MTA and construct a 1,150-unit apartment complex on Quay Street, with buildings reaching 600 feet tall - among the highest in the neighborhood - across a narrow estuary from the long-stalled Bushwick Inlet Park. The 28-acre greenspace was a centerpiece of the sweeping land use plan that transformed Greenpoint and neighboring Williamsburg, but remains years from completion amid legal battles over cleanup of the toxins left behind by fossil fuel companies.