The evidence suggests the steps were recognized as a D.C. landmark in a ceremonial event, but none of the provided sources confirm that the steps are now an 'official Washington monument' in a definitive, permanent sense. The claim is based on a single interpretation of the event's significance.

While multiple sources mention William Friedkin and 'The Exorcist,' the specific claim that he 'had no idea' the steps would become famous is attributed to a specific narrative (likely from an interview or article) that is not independently corroborated by the provided evidence. The evidence only confirms his involvement and the film's connection to the steps.

The web search results provided for this claim are about unrelated events (Anchorage, Capitals, IU players) and do not contain evidence about fans lining up for signatures or a commemorative plaque related to 'The Exorcist' steps. Therefore, the claim cannot be corroborated by the provided evidence, and the evidence count is misleading.

The evidence provides general information about Georgetown and major D.C. streets (14th Street, 16th Street, K Street), but none of the provided sources specifically state that the steps 'replaced what was once 36th Street NW.' The claim is based on an unverified assertion not supported by the provided evidence.