(WKYC-TV) – There are new details about why the Ohio Department of Transportation denied the Cleveland Browns’ construction permit in Brook Park.

Letters obtained by the WKYC newsroom show Cleveland Port Control Director Bryant Francis warned both the FAA and ODOT in March that the stadium’s proposed height could violate federal airspace safety standards.

He repeated that warning in June.

Those concerns led ODOT to reject the permit on August 1st.

The Browns could still appeal as legal challenges continue.