brookfield chief executive richard clark wrote a letter tuesday to new york police commissioner ray kelly, saying, "after weeks of occupation, conditions at the park have deteriorated to unsanitary and unsafe levels." commissioner kelly had this to say today. >> it's complex. people have a right to be there. but brookfield has the right to sort of establish the ground rules. so that's what's happening now. they now have decided that they want to clean the area. and they're going to do that. we'll stand by to make sure that, you know, the peace is maintained. >> commissioner kelly says the protesters will be allowed to re-enter the park after its cleaning. but according to a notice distributed from brookfield, camping and/or the use of tents, sleeping bags, and simply lying down will all be prohibited in the park. occupy wall street's cleanups facebook page reads, "friday morning we'll awake and position ourselves with our brooms and mops in a human chain around the park, linked at the arms. if nypd attempts to enter, we'll peacefully, non-violently stand our ground, and those who are will