The protestors say the building was carefully planned and "up to code," but the police say otherwise.

And given that the structure was erected overnight, one might wonder what "code" the demonstrators were following?

Washington Post:

The Occupy D.C. campaign, largely peaceful since its launch two months ago, turned confrontational Sunday when police detained 31 protesters during a tense day-long standoff in McPherson Square. It was the first case of mass arrests at the group's base camp in Washington, and the clash resembled those between police and Occupy protesters in other cities across the country.

The day began with a seemingly minor dispute over a 15-foot-tall wood shelter that protesters put up Saturday night in the park's grassy southwest corner. But it soon escalated into a noisy downtown disruption - and a psychological turning point in the protests - after a group of demonstrators defied repeated orders by the U.S. Park Police to dismantle and abandon the half-built shed.

During the day, officers arrested 15 demonstrators and charged them with crossing a police line, Park Police spokesman Sgt. David Schlosser said. Shortly after nightfall, police moved in and detained the protesters who had remained inside the open shed all day, and 16 people were charged with disobeying a lawful police order. One of them also was charged with resisting arrest, indecent exposure and urinating in public.

Six people clung to the roof of the shed, but police were able to remove all of them by 8:35 p.m. and later dismantled the shelter.

You have to wonder at the mindset of these people. The arrogance in believing that the rules don't apply to them is breathtaking. The chaos these people are causing may be their primary goal, but they are winning no friends and no general support in the public by using these outrageous tactics.