What action is prohibited in off-street city-controlled parking lots?

Unauthorized non-parking use is prohibited in off-street city-controlled parking lots because these areas are designated specifically for parking vehicles. Allowing activities outside of this purpose can lead to safety concerns, inconvenience for drivers seeking parking, and potential liabilities for the city as the property owner. The primary intent of these lots is to facilitate parking, and any misuse—such as gatherings, recreational activities, or other non-parking purposes—can impede the effectiveness of the parking facility and disrupt traffic flow.

In the context of the other options, while parking trailers, parking after meter expiration, and consuming alcohol may also present issues, they are more specific regulations or laws that can vary by location. The prohibition of unauthorized non-parking use is a broader rule that focuses on maintaining the intended function of the parking lot.