A productive approach is to keep it practical and non-confrontational rather than legalistic.

Start by asking what specific harm they’re worried about: “What are you concerned a photographer might do here?” That often helps separate general security fears from actual risks. In an open plaza/park, many of the concerns security has for office interiors or restricted areas may not really apply.

It also helps to ask whether they have a clear photography policy. If they want restrictions, those should be defined and communicated consistently rather than enforced ad hoc.

The most persuasive case may be positive rather than argumentative: show the kind of images being made and how they present the space well. A strong photo of the property can demonstrate that photography is often promotion, documentation, or personal expression—not a threat.

Finally, behavior matters. Be open about photographing, avoid acting secretive, respect people who don’t want to be photographed, and stay courteous. A calm, visible photographer is much less likely to be perceived as suspicious than someone evasive or confrontational.