SEATTLE (February 7, 2013)—A tower crane that workers are using to build a 304-unit apartment complex in Seattle have hit a snag.

Two raccoons climbed 150 feet up the crane and made a home behind the crane's cab, bringing the giant machine to a temporary halt.

A crane operator spotted the new residents while ascending the tower Wednesday.

The general contractor, Rafn Company, called in experts who were trying to catch the two raccoons using humane traps.

Project superintendent John Kellberg said it’s a first for him.

The apartment complex in the city's Ballard neighborhood is due to open in the summer of 2014.