The building that faced the courtyard on the west side was seventy cubits in width

"There was a building on the west side of the temple area, and its entrance was towards the courtyard. It was seventy cubits in width"

seventy cubits ... five cubits ... ninety cubits

"about 38 meters ... about 2.7 meters ... about 49 meters". Each long cubit was about 54 centimeters. See Ezekiel 40:5.