Ezekiel 41:7

‘And the side-chambers were broader as they went round the house level by level. For the surrounds of the house went up level by level around the house. So the breadth of the house continued upwards, and one went from the lowest level to the highest level via the middle level.

The rooms on the upper floor were the largest,, the rooms on the second floor were not as large, and the rooms on the first floor were the smallest. We are given no detail or explanation. What we do know is that it indicated that in God's heavenly temple there was a place for man. He could enter and serve there.