Hidden Assets
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There is plenty of precedent for hidden facilities - some of them quite large - even in famous pieces of architecture:
https://www.oddee.com/item_99554.aspx
So far, no-one has given me grief over superhero bases in my Masks stories. This should head off anyone doing so. :-)
The Vatican is famous not only for concealed nooks and crannies, but walkways high above ground.
Anyway, Happy Holidays to all!