From a National Park Service memo accompanying proposed regulations for demonstrations in Lafayette Park:

The presence of structures has been of particular concern in Lafayette Park. Without limitations on the size and use of structures, individuals have accumulated an odd assortment of buildings and rubbish in the park, often unattended. Several two-and three-story structures have been built in Lafayette Park. Desks, chairs, bookcases, carts, doors and a porcelain toilet have all appeared in the park. One individual filled a broken grocery cart with trash, claiming that it was a symbolic structure. All in all, the presence of these items has produced a dump- like atmosphere in this historical and finely landscaped park.

Further, it appears that the "development" of Lafayette Park will only worsen in the future. Recently, an individual requested a permit to establish a library, complete with meeting rooms, in the park. The same individual requested a permit to erect facilities necessary for an actual abortion and a Christmas Day live birth. Another individual requested a permit for a spaceship and spaceship-landing facilities. This "building boom" in Lafayette Park threatens aesthetic interests, safety interests and park resources. . . .

The National Park Service is not proposing to prohibit demonstrations in Lafayette Park. Nor is it proposing to place any limitation on signs that are hand-carried. The Park Service is merely proposing to place reasonable, content-neutral limitations on signs placed down in Lafayette Park so that visitors might be able to enjoy the history and beauty of the park while demonstrators have ample avenues of communication. . . .