All of the lamp posts I have seen so far were aluminum, these do not rust, they can corrode but not usually to the extent that the post fails. As noted above I would check the foundation. Be very careful where the wiring enters the post. I have seen 2 installations where there were notches cutout of the post with rough edges that caused electrical problems.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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