Albert Barnes Commentary Ezekiel 45:5

"And five and twenty thousand in length, and ten thousand in breadth, shall be unto the Levites, the ministers of the house, for a possession unto themselves, [for] twenty chambers." — Ezekiel 45:5 (ASV)

For a possession for twenty chambers - literally, For a possession twenty chambers, possibly twenty out of the thirty chambers in the outer court (Ezekiel 40:17), and assigned for their use during residence in the sanctuary. The Septuagint reads for cities to dwell in which some adopt here.