Renderings of second scheme at high end with 35 units per plot.

Each block can hold 35 units as shown.
Therefore:
•  Units: 688 blocks per square mile x 35 units = One square mile city holds 24,080 units total

•  People: 688 blocks x 232 people per block = One square mile city holds 159,616 people

14 square miles x 159,616 people = 2,234,624 people