What does Ezekiel 40:29 mean?

Its guardrooms, pillars, and porch were the same size as the others. The gate and its porch had windows all around. It was about eighty-seven and a half feet long and forty-three and three-quarters feet wide. Ezekiel 40:29 - Modern Text Bible

(The inner south gate matches the outer gates in every detail, from the rooms to the windows and overall size.)