Så vitt jag kan se från din kod ser det ut som att du bara borde kunna göra:
for i, row in enumerate(c):
box_x = ((row[3]-row[1])/2 + row[1] - 0.25)
box_y = ((row[4]-row[2])/2 + row[2] - 0.25)
move1 = box_y * 2
try1 = row[1] * 2
print('<rect id="rectangle{0}" class="rectangles" x="{1}" y="{2}" width="{3}" height="{4}" onmousemove="myFunction3()"><title>Owned by {5}</title></rect>'.format(i, row[1], row[2], row[3] - row[1], row[4] - row[2], row[6]))