Wooden walls are being erected around City Hall and the Portland Building to protect them from vandalism.

According to Mayor Ted Wheeler’s office, despite other fencing that was put up last week, both buildings continue to be marked with graffiti each night of the ongoing protests.

“Cleaning the buildings each day is taking public resources, particularly due to the limestone surface at City Hall. We are looking into the possibility of partnering with the arts community to create murals on the plywood in support of the racial justice movement,” Wheeler’s office told the Portland Tribune.

Protests have taken place downtown for more than 11 nights in a row following the death of African-American George Floyd at the hands of the Minneapolis police. Although the most intense activity has taken place at the Justice Center, other buildings have been repeatedly vandalized, too, including the Mark O. Hatfield U.S. Courthouse and Pioneer Place.