Editing HQ rules from M&M2e (section)

==HEADQUARTERS==

Whether it’s an underground cave, the top floors of a skyscraper, a satellite
in orbit, or a base on the Moon, many heroes and villains maintain
their own secret (or not so secret) headquarters. Teams of characters also
may even pool their equipment points to have a headquarters they share,
with the Gamemaster’s approval.

A headquarters is unlike other “equipment” in that it is fixed and serves
as a home base, not something normally carried around. An especially
large vehicle may serve as a kind of mobile headquarters, and the GM
may allow characters to install some headquarters features into vehicles
of Gargantuan or greater size.

A character can even have multiple bases of operation. This is more common
for villains, who have back-up plans and secret bases they can retreat
to when their plans are defeated. If a character’s headquarters is destroyed,
the character can choose to rebuild it or build a new headquarters with
different features. Supervillains often go through a succession of different
=headquarters. At the Gamemaster’s option, characters can have additional
headquarters as “Alternate Power” feats of the first (see Alternate Power,
page 108), since they aren’t likely to be used all at once.