The critter, which was dubbed #MPRraccoon online, was first spotted on a ledge of the building a few stories high on Tuesday morning.
On Tuesday, building maintenance workers were able to get the poor little guy to move, but he unfortunately took a more risky route, climbing UBS Tower next door.
The raccoon has now made its way 23 stories up the exterior of the UBS Financial Services building.
No word yet on how crews plan to get it down.
Amid hundreds of photos and retweets from fascinated and frightened pedestrians, the raccoon finally came to a stop on the ledge of a swanky 22nd floor office - just one floor below the top.
On the street below, an onlooker thought "Wally" would make a good name for overly ambitious mammal, though Minnesota Public Radio employees - who work across the street - promptly created a hashtag "MPRracoon", which caught on.
A spokeswoman for the city's Department of Safety and Inspections, which oversees animal control, told the Twin Cities Pioneer Press that they planned to set a trap with food at the top of the building.
By Tuesday afternoon, the raccoon had its own Twitter account, with its first tweet saying, "I made a big mistake".
There will be someone monitoring the animal overnight, Brickley said.