It is a flat roof, to which the residents have no access, and is four stories up
Your insurance company might help you out here - call them.
Not covered on my policy, but they have put me in touch with the surveyors that they use.
Also, they're amazed that the managing agent has made this my problem to solve.
@Howard started
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It is a flat roof, to which the residents have no access, and is four stories up