Authorities plan to arrest man scaling skyscraper in San Francisco once he reaches the top

just as soon as he reaches the top.

The San Francisco Fire Department says the man was too high for firefighters to reach by the time they responded to calls that he was climbing the building Monday afternoon.

Video from KRON-TV showed the unidentified climber using what appeared to be suction cups to scale Millennium Tower, a posh residential building overlooking San Francisco Bay. Police say the man has ignored all orders to stop climbing the building.

Well-known French skyscraper climber Alain Robert pleaded not guilty Friday to charges related to climbing up a 57-story building in downtown Sydney.

Robert typically climbs buildings using his bare hands.

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Information from: KRON-TV